Exact Mass: 828.2317608000001
Exact Mass Matches: 828.2317608000001
Found 170 metabolites which its exact mass value is equals to given mass value 828.2317608000001,
within given mass tolerance error 0.05 dalton. Try search metabolite list with more accurate mass tolerance error
0.01 dalton.
Verbascose
Verbascose is a pentasaccharide that is stachiose which has an additional unit of alpha-D-galactopyranose attached by a 1->6 glycosidic linkage to the terminal galactosyl residue. It is a pentasaccharide and a raffinose family oligosaccharide. It is functionally related to a stachyose. Verbascose is a natural product found in Vigna radiata, Cajanus cajan, and other organisms with data available. Verbascose is a member of the class of compounds known as oligosaccharides. Oligosaccharides are carbohydrates made up of 3 to 10 monosaccharide units linked to each other through glycosidic bonds. Verbascose is soluble (in water) and a very weakly acidic compound (based on its pKa). Verbascose can be synthesized from stachyose. Verbascose can also be synthesized into ajugose. Verbascose can be found in a number of food items such as sesbania flower, silver linden, wild carrot, and burbot, which makes verbascose a potential biomarker for the consumption of these food products.
Maltopentaose
Constituent of corn syrup. Amylolysis production from starch. Maltooligosaccharide mixtures are important food additives (sweeteners, gelling agents and viscosity modifiers) Beta-cellopentaose is a cellopentaose in which the anomeric centre at the reducing end has beta-configuration. a 1,4-α-D-glucan reacts with H2O to produce maltopentaose. Alpha-amylase catalyzes the reaction. Maltopentaose is the shortest chain oligosaccharide that can be classified as maltodextrin and is also used in a study to investigate glycation and phosphorylation of α-lactalbumin.
Amylopectin
Amylopectin is a highly branched polymer of glucose found in plants. It is one of the two components of starch, the other being amylose. It is insoluble in water. Glucose units are linked in a linear way with α(1→4) bonds. Branching takes place with α(1→6) bonds occurring every 24 to 30 glucose units. Its counterpart in animals is glycogen which has the same composition and structure, but with more extensive branching that occurs every 8 to 12 glucose units. Starch is made of about 80\\% amylopectin. Amylopectin is highly branched, being formed of 2 000 to 200 000 glucose units. Its inner chains are formed of 20-24 glucose subunits. The glucose residues are linked through alpha-1,4 glycosidic linkages (Wikipedia). Amylopectin (CAS# 9037-22-3) is a highly branched polymer of glucose found in plants. It is one of the two components of starch, the other being amylose. It is insoluble in water. Same as: D11546
iron(2+);3-[(2S,3S,7S,8S)-7,13,17-tris(2-carboxyethyl)-3,8-bis(carboxymethyl)-3,8,12,18-tetramethyl-2,7-dihydroporphyrin-21,23-diid-2-yl]propanoic acid
Luteolin 7-O-(2-apiosyl-4-glucosyl-6-malonyl)-glucoside
Luteolin 7-O-(2-apiosyl-4-glucosyl-6-malonyl)-glucoside is a polyphenol compound found in foods of plant origin (PMID: 20428313)
Cellopentaose
Sinistrin
Triglutamate folate
Verbascose
Luteolin 7-O-(2-apiofuranosyl-4-glucopyranosyl-6-malonyl)glucopyranoside
Luteolin 7-o-(2-apiofuranosyl-4-glucopyranosyl-6-malonyl)glucopyranoside is a member of the class of compounds known as flavonoid-7-o-glycosides. Flavonoid-7-o-glycosides are phenolic compounds containing a flavonoid moiety which is O-glycosidically linked to carbohydrate moiety at the C7-position. Thus, luteolin 7-o-(2-apiofuranosyl-4-glucopyranosyl-6-malonyl)glucopyranoside is considered to be a flavonoid lipid molecule. Luteolin 7-o-(2-apiofuranosyl-4-glucopyranosyl-6-malonyl)glucopyranoside is slightly soluble (in water) and a weakly acidic compound (based on its pKa). Luteolin 7-o-(2-apiofuranosyl-4-glucopyranosyl-6-malonyl)glucopyranoside can be found in a number of food items such as yellow bell pepper, green bell pepper, italian sweet red pepper, and red bell pepper, which makes luteolin 7-o-(2-apiofuranosyl-4-glucopyranosyl-6-malonyl)glucopyranoside a potential biomarker for the consumption of these food products.
beta-D-Fructofuranosyl-(2->1)-beta-D-fructofuranosyl-(2->6)-alpha-D-glucopyranosyl-(1->2)-beta-D-fructofuranosyl beta-D-fructofuranoside
Isolated from the roots of asparagus (Asparagus officinalis). beta-D-Fructofuranosyl-(2->1)-beta-D-fructofuranosyl-(2->6)-alpha-D-glucopyranosyl-(1->2)-beta-D-fructofuranosyl beta-D-fructofuranoside is found in green vegetables.
Fructosylnystose
1F-Fructofuranosylnystose is a natural product found in Saussurea costus and Allium cepa with data available. 1F-Fructofuranosylnystose can be used in the synthesis of Fructooligosaccharides (FOSs). Fructooligosaccharides exhibit lots of beneficial effects on our health and have been used as food ingredients. 1F-Fructofuranosylnystose can be used in the synthesis of Fructooligosaccharides (FOSs). Fructooligosaccharides exhibit lots of beneficial effects on our health and have been used as food ingredients.
cellopentaose
Beta-cellopentaose is a cellopentaose in which the anomeric centre at the reducing end has beta-configuration. Maltopentaose is a maltopentaose pentasaccharide in which the glucose residue at the reducing end is in the aldehydo open-chain form. (2R,3R,4R,5R)-4-[(2R,3R,4R,5S,6R)-5-[(2R,3R,4R,5S,6R)-5-[(2R,3R,4R,5S,6R)-3,4-dihydroxy-6-(hydroxymethyl)-5-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-3,4-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-3,4-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-2,3,5,6-tetrahydroxyhexanal is a natural product found in Drosophila melanogaster with data available. A maltopentaose pentasaccharide in which the glucose residue at the reducing end is in the aldehydo open-chain form. Maltopentaose is the shortest chain oligosaccharide that can be classified as maltodextrin and is also used in a study to investigate glycation and phosphorylation of α-lactalbumin.
TubulosideA
Tubuloside A is a phenylethanoid glycoside with antioxidative effect and hepatoprotective activity. Tubuloside A is a phenylethanoid glycoside with antioxidative effect and hepatoprotective activity.
Tubuloside
Tubuloside A is a phenylethanoid glycoside with antioxidative effect and hepatoprotective activity. Tubuloside A is a phenylethanoid glycoside with antioxidative effect and hepatoprotective activity.
2)-O-[beta-D-glucopyranosyl-(1-
alpha-D-Galp-(1->6)-alpha-D-Galp-(1->6)-alpha-D-[alpha-D-Galp-(1->2)]Galp-(1->6)-D-Galp
Beta-D-Fructofuranosyl-(2?1)-beta-D-fructofructofuranosyl-(2?6)-alpha-D-glucopyranoside|betabeta-D-Fructofuranosyl-(2?1)-beta-D-fructofuranosyl-(2?1)-beta-D-fructofuranosyl-(2?6)-alpha-D-glucopyranoside
1F(1-beta-D-fructofuranosyl)2-6G-beta-D-fructofuranosyl-sucrose|1F(1-beta-Fructofuranosyl)2-6G-beta-fructofuranosylsucrose
alpha-D-Man-(1->3)-alpha-D-Man-(1->3)-alpha-D-Man-(1->3)-alpha-D-Man-(1->2)-D-Man
1,6-di-O-[4-O-(beta-D-glucopyranosyl)-E-caffeoyl]-beta-D-glucopyranose|scrocaffeside C
1,1,6G-kestopentaose|6G(1-beta-D-fructofuranosyl)3-sucrose|6G(1-beta-fructofuranosyl)(3)-sucrose
1-hydroxy-3,6,7,8-tetramethoxy-2-methylanthraquinone 1-O-alpha-L-rhamnopyranosyl-(1->6)-O-beta-D-glucopyranosyl-(1->6)-O-beta-D-galactopyranoside
alpha-D-Glcp-(1->4)-alpha-D-Glcp-(1->4)-alpha-D-Glcp-(1->4)-Glcp-(1<->2)-beta-D-Fruf|alpha-D-glucopyranosyl-(1->4)-alpha-D-glucopyranosyl-(1->4)-alpha-D-glucopyranosyl-(1->4)-alpha-D-glucopyranosyl-(1->2)-beta-D-fructofuranoside
[O1-(O6-alpha-D-Galactopyranosyl-alpha-D-galactopyranosyl)-beta-D-fructofuranosyl]-(O6-alpha-D-galactopyranosyl-alpha-D-glucopyranosid)|[O1-(O6-alpha-D-galactopyranosyl-alpha-D-galactopyranosyl)-beta-D-fructofuranosyl]-(O6-alpha-D-galactopyranosyl-alpha-D-glucopyranoside)
[O3-(O6-alpha-D-galactopyranosyl-alpha-D-galactopyranosyl)-beta-D-fructofuranosyl]-{O6-alpha-D-galactopyranosyl-alpha-D-glucopyranoside}|[O3-(O6-alpha-D-Galactopyranosyl-alpha-D-galactopyranosyl)-beta-D-fructofuranosyl]-{O6-alpha-D-galactopyranosyl-alpha-D-glucopyranosid}
3-galactotriosyllactose|3)>3-beta-D-Gal-(1<*>4)-D-Glc|beta-D-Galp-(1->3)-beta-D-Galp-(1->3)-beta-D-Galp-(1->3)-beta-D-Galp-(1->4)-D-Glc|Galbeta1-3Galbeta1-3Galbeta1-3Galbeta1-4Glc
1-<2-(3-Acetoxy-4-methoxyphenyl)ethyl>-2,4,6,2,3,4,6-heptaacetyl-beta-laminaribiosid|1-[2-(3-Acetoxy-4-methoxyphenyl)ethyl]-2,4,6,2,3,4,6-heptaacetyl-beta-laminaribiosid
alpha-D-Glcp-(1->6)-alpha-D-Glcp-(1->4)-alpha-D-Glcp-(1->4)-alpha-D-Glcp-(1<->2)-beta-D-Fruf
Cyanidin 3-O-[2-O-(xylosyl) glucoside] 5-O-(6-O-malonyl) glucoside
Cyanidin 3-O-[(6-O-malonyl-2-O-beta-D-xylopyranosyl)-beta-D-glucopyranoside]-7-O-beta-D-glucopyranoside
DP5
Acquisition and generation of the data is financially supported by the Max-Planck-Society; This is a mixture of 56 \\% Glcbeta1-3Glc, 24 \\% Glcbeta1-4Glc, 6 \\% Glcbeta1-6Glc, and 14 \\% branched or terminal Glc. Thisis a glucan of Phytophthora cell wall.
Luteolin 7-O-(2-apiofuranosyl-4-glucopyranosyl-6-malonyl)glucopyranoside
Isorhamnetin 3-[2-(4-acetylrhamnosyl)-gentiobioside]
Maltopentaose
Maltopentaose is the shortest chain oligosaccharide that can be classified as maltodextrin and is also used in a study to investigate glycation and phosphorylation of α-lactalbumin.
Luteolin 7-O-(2-apiosyl-4-glucosyl-6-malonyl)-glucoside
Octakis(trimethylsiloxy)silsesquioxane
C24H72O10Si11 (828.2587292000001)
4,4-[1,3,4-oxadiazole-2,5-diyl]-bis[(2-methyl-4,1-phenylene)azo] bis[3-hydroxy]-n-phenyl-2-naphthalenecarboxamide
C50H36N8O5 (828.2808525999999)
Verbascose
Verbacose is a member of the class of compounds known as oligosaccharides. Oligosaccharides are carbohydrates made up of 3 to 10 monosaccharide units linked to each other through glycosidic bonds. Verbacose is soluble (in water) and a very weakly acidic compound (based on its pKa). Verbacose can be found in soy bean, which makes verbacose a potential biomarker for the consumption of this food product.
beta-D-Fructofuranosyl-(2->1)-beta-D-fructofuranosyl-(2->6)-alpha-D-glucopyranosyl-(1->2)-beta-D-fructofuranosyl beta-D-fructofuranoside
Hex2ulof(?2-1)Hex2ulof(?2-1)[Hex2ulof(?2-6)]Hex2ulof(?2-1?)Hex
uroporphyrinogen III(8-)
C40H36N4O16-8 (828.2126215999999)
COVID info from COVID-19 Disease Map Corona-virus Coronavirus SARS-CoV-2 COVID-19 SARS-CoV COVID19 SARS2 SARS
alpha-D-glucopyranosyl-(1->4)-alpha-D-glucopyranosyl-(1->4)-alpha-D-glucopyranosyl-(1->4)-alpha-D-glucopyranosyl-(1->4)-D-glucopyranose
3-[7,12,17-Tris(2-carboxyethyl)-3,8,13,18-tetrakis(carboxymethyl)porphyrin-2-yl]propanoic acid
C40H36N4O16 (828.2126215999999)
2-amino-6-[(4-amino-4-carboxybutanoyl)-[4-[(2-amino-4-oxo-3H-pteridin-6-yl)methylamino]benzoyl]amino]-6-(4-amino-4-carboxybutanoyl)oxycarbonyl-5-oxononanedioic acid
beta-D-glucopyranosyl-(1->4)-beta-D-glucopyranosyl-(1->4)-beta-D-glucopyranosyl-(1->4)-beta-D-glucopyranosyl-(1->4)-D-glucopyranose
alpha-D-Manp-(1->2)-alpha-D-Manp-(1->3)-[alpha-D-Manp-(1->2)-alpha-D-Manp-(1->6)]-alpha-D-Manp
Beta-D-Glucopyranosyl-(1->3)-Beta-D-Glucopyranosyl-(1->3)-Beta-D-Glucopyranosyl-(1->3)-Beta-D-Glucopyranosyl-(1->3)-Beta-D-Glucopyranose
alpha-D-Manp-(1->3)-[alpha-D-Manp-(1->3)-[alpha-D-Manp-(1->6)]-alpha-D-Manp-(1->6)]-beta-D-Manp
alpha-D-mannosyl-(1->3)-[alpha-D-mannosyl-(1->6)]-alpha-D-mannosyl-(1->2)-alpha-D-mannosyl-(1->2)-D-mannose
beta-D-mannopyranosyl-(1->4)-[alpha-D-galactopyranosyl-(1->6)]-beta-D-mannopyranosyl-(1->4)-beta-D-mannopyranosyl-(1->4)-D-mannopyranose
(2S,3S,4S,5S,6R)-2-[(2R,3S,4R,5S,6S)-6-[(2R,3S,4R,5S,6S)-6-[(2R,3S,4R,5S,6S)-4,5-dihydroxy-2-(hydroxymethyl)-6-[(2R,3S,4R,5S,6R)-4,5,6-trihydroxy-2-(hydroxymethyl)oxan-3-yl]oxyoxan-3-yl]oxy-4,5-dihydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-4,5-dihydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-6-(hydroxymethyl)oxane-3,4,5-triol
(2S,3S,4S,5S,6R)-2-[(2R,3S,4R,5S,6S)-6-[(2R,3S,4R,5S,6S)-6-[(2R,3S,4R,5S,6S)-4,5-dihydroxy-2-(hydroxymethyl)-6-[(2R,3S,4R,5S,6S)-4,5,6-trihydroxy-2-(hydroxymethyl)oxan-3-yl]oxyoxan-3-yl]oxy-4,5-dihydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-4,5-dihydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-6-(hydroxymethyl)oxane-3,4,5-triol
alpha-D-Man-(1right3)-[alpha-D-Man-(1right6)-[alpha-D-Man-(1right3)]-alpha-D-Man-(1right6)]-D-Man
beta-D-galactofuranosyl-(1->5)-beta-D-galactofuranosyl-(1->5)-beta-D-galactofuranosyl-(1->5)-beta-D-galactofuranosyl-(1->6)-D-mannose
beta-D-Manp-(1->2)-beta-D-Manp-(1->2)-alpha-D-Manp-(1->2)-alpha-D-Manp-(1->2)-alpha-D-Manp
alpha-D-mannosyl-(1->3)-alpha-D-mannosyl-(1->2)-alpha-D-mannosyl-(1->2)-alpha-D-mannosyl-(1->2)-D-mannose
alpha-D-mannosyl-(1->2)-alpha-D-mannosyl-(1->2)-alpha-D-mannosyl-(1->2)-alpha-D-mannosyl-(1->6)-D-mannose
alpha-D-mannosyl-(1->2)-alpha-D-mannosyl-(1->2)-alpha-D-mannosyl-(1->2)-alpha-D-mannosyl-(1->2)-D-mannose
alpha-D-mannosyl-(1->6)-alpha-D-mannosyl-(1->6)-alpha-D-mannosyl-(1->6)-alpha-D-mannosyl-(1->6)-D-mannose
alpha-D-Manp-(1->2)-alpha-D-Manp-(1->2)-[alpha-D-Manp-(1->2)-alpha-D-Manp-(1->6)]-D-Manp
alpha-D-mannosyl-(1->3)-[alpha-D-mannosyl-(1->2)-alpha-D-mannosyl-(1->2)-alpha-D-mannosyl-(1->6)]-alpha-D-mannose
Gal4S(b1-4)GlcNAc(b1-6)[Gal(b1-3)]GalNAc
C28H48N2O24S (828.2317608000001)
Gal(b1-4)GlcNAc6S(b1-6)[Gal(b1-3)]GalNAc
C28H48N2O24S (828.2317608000001)
Gal(b1-3)GlcNAc(b1-6)[Gal6S(b1-3)]GalNAc
C28H48N2O24S (828.2317608000001)
alpha-D-mannopyranosyl-(1->3)-[alpha-D-mannopyranosyl-(1->3)-alpha-D-mannopyranosyl-(1->6)-alpha-D-mannopyranosyl-(1->6)]-D-mannopyranose
Gal4S(b1-4)GlcNAc(b1-6)[Gal(b1-3)]a-GalNAc
C28H48N2O24S (828.2317608000001)
Gal(b1-4)GlcNAc6S(b1-3)Gal(b1-3)b-GalNAc
C28H48N2O24S (828.2317608000001)
D-galacto-hexopyranosyl-(1->4)-2-acetamido-2-deoxy-6-O-sulfo-D-gluco-hexopyranosyl-(1->6)-[D-galacto-hexopyranosyl-(1->3)]-2-acetamido-2-deoxy-alpha-D-galacto-hexopyranose
C28H48N2O24S (828.2317608000001)
D-galacto-hexopyranosyl-(1->4)-2-acetamido-2-deoxy-6-O-sulfo-D-gluco-hexopyranosyl-(1->6)-[D-galacto-hexopyranosyl-(1->3)]-2-acetamido-2-deoxy-beta-D-galacto-hexopyranose
C28H48N2O24S (828.2317608000001)
Gal6S(b1-4)GlcNAc(b1-3)Gal(b1-3)b-GalNAc
C28H48N2O24S (828.2317608000001)
Gal6S(b1-4)GlcNAc(b1-3)Gal(b1-3)a-GalNAc
C28H48N2O24S (828.2317608000001)
Gal(b1-4)GlcNAc6S(b1-6)[Gal(b1-3)]b-GalNAc
C28H48N2O24S (828.2317608000001)
Gal4S(b1-4)GlcNAc(b1-6)[Gal(b1-3)]b-GalNAc
C28H48N2O24S (828.2317608000001)
Gal6S(b1-3)GlcNAc(b1-6)[Gal(b1-3)]GalNAc
C28H48N2O24S (828.2317608000001)
Gal(b1-4)GlcNAc(b1-6)[Gal6S(b1-3)]GalNAc
C28H48N2O24S (828.2317608000001)
Gal(b1-4)GlcNAc6S(b1-3)Gal(b1-3)GalNAc
C28H48N2O24S (828.2317608000001)
D-galacto-hexopyranosyl-(1->4)-2-acetamido-2-deoxy-6-O-sulfo-D-gluco-hexopyranosyl-(1->6)-[D-galacto-hexopyranosyl-(1->3)]-2-acetamido-2-deoxy-D-galacto-hexopyranose
C28H48N2O24S (828.2317608000001)
Gal3S(b1-4)GlcNAc(b1-6)[Gal(b1-3)]GalNAc
C28H48N2O24S (828.2317608000001)
alpha-D-mannopyranosyl-(1->2)-[alpha-D-mannopyranosyl-(1->2)-alpha-D-mannopyranosyl-(1->6)-alpha-D-mannopyranosyl-(1->6)]-D-mannopyranose
Gal6S(b1-4)GlcNAc(b1-3)Gal(b1-3)GalNAc
C28H48N2O24S (828.2317608000001)
Gal6S(b1-4)GlcNAc(b1-6)[Gal(b1-3)]GalNAc
C28H48N2O24S (828.2317608000001)
D-manno-hexopyranosyl-(1->4)-D-manno-hexopyranosyl-(1->4)-D-manno-hexopyranosyl-(1->4)-D-manno-hexopyranosyl-(1->4)-D-manno-hexopyranose
Gal(b1-4)GlcNAc(b1-3)Gal6S(b1-3)GalNAc
C28H48N2O24S (828.2317608000001)
Gal3S(b1-4)GlcNAc(b1-6)[Gal(b1-3)]b-GalNAc
C28H48N2O24S (828.2317608000001)
Gal(b1-4)GlcNAc6S(b1-3)Gal(b1-3)a-GalNAc
C28H48N2O24S (828.2317608000001)
Gal3S(b1-4)GlcNAc(b1-6)[Gal(b1-3)]a-GalNAc
C28H48N2O24S (828.2317608000001)
Gal(b1-4)GlcNAc6S(b1-6)[Gal(b1-3)]a-GalNAc
C28H48N2O24S (828.2317608000001)
Gal4Sbeta1-4GlcNAc1-3Galbeta1-4GlcNAcbeta
C28H48N2O24S (828.2317608000001)
(2R,4S,5R)-4-[(2S,4S,5R)-4-[(2S,4S,5R)-4-[(2S,4S,5R)-3,5-dihydroxy-6-(hydroxymethyl)-4-[(2S,4R,5S)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-3,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-3,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-6-(hydroxymethyl)oxane-2,3,5-triol
(2S,4R,5S)-4-[(2R,4R,5S)-4-[(2R,4R,5S)-4-[(2R,4R,5S)-3,5-dihydroxy-6-(hydroxymethyl)-4-[(2S,4R,5S)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-3,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-3,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-6-(hydroxymethyl)oxane-2,3,5-triol
alpha-Maltopentaose
A maltopentaose pentasaccharide in which the glucose residue at the reducing end is in the pyranose ring form and has alpha configuration at the anomeric carbon atom.
beta-D-GlcpNAc-(1->3)-beta-D-Galp-(1->4)-beta-D-GlcpNAc6S-(1->3)-D-Galp
C28H48N2O24S (828.2317608000001)
An amino tetrasaccharide comprised of two N-acetylated glucosamine residues, of which one is sulfated on O-6, and two galactosyl residues, of which one is at the reducing end. It is an intermediate in the keratan sulfate degradation pathway.
12,18-Didecarboxysirohaem
A heme that consists of sirohaem lacking the two carboxy groups at positions 12 and 18.
uroporphyrinogen I(8-)
C40H36N4O16 (828.2126215999999)
The cyclic tetrapyrrole anion that is the octacarboxylate anion of uroporphyrinogen I.
[3)-beta-D-Glcp-(1->]5
A (1->3)-beta-D-glucan consisting of five D-glucosyl residues linked in a linear sequence.
uroporphyrinogen III(8-)
C40H36N4O16 (828.2126215999999)
An octacarboxylic acid anion obtained by deprotonation of all eight carboxy groups of uroporphyrinogen III.