Exact Mass: 852.2859022
Exact Mass Matches: 852.2859022
Found 48 metabolites which its exact mass value is equals to given mass value 852.2859022,
within given mass tolerance error 0.05 dalton. Try search metabolite list with more accurate mass tolerance error
0.01 dalton.
Viroisin, 2-(2-(methylsulfinyl)-L-tryptophan)-3-(4,5-dihydroxy-L-leucine)-4-L-alanine- 7
Viroisin, 2-(2-(methylsulfinyl)-L-tryptophan)-3-(4,5-dihydroxy-L-leucine)-4-L-alanine- 7
C36H52N8O14S (852.3323532000001)
(1,3-O-di-p-coumaroyl-6-O-feruloyl)-beta-D-fructofuranosyl-(2->1)-(6-O-acetyl)-alpha-D-glucopyranoside|smilaside I
(1,3-O-di-p-coumaroyl-6-O-feruloyl)-beta-D-fructofuranosyl-(2->1)-(6-O-acetyl)-alpha-D-glucopyranoside|smilaside I
(1,3-O-di-p-coumaroyl-6-O-feruloyl)-beta-D-fructofuranosyl-(2->1)-(2-O-acetyl)-alpha-D-glucopyranoside|smilaside H
(1,3-O-di-p-coumaroyl-6-O-feruloyl)-beta-D-fructofuranosyl-(2->1)-(2-O-acetyl)-alpha-D-glucopyranoside|smilaside H
2-Naphthalenecarboxamide,4,4-[(3,3-dimethoxy[1,1-biphenyl]-4,4-diyl)bis(2,1-diazenediyl)]bis[3-hydroxy-N-(2-methoxyphenyl)-
2-Naphthalenecarboxamide,4,4-[(3,3-dimethoxy[1,1-biphenyl]-4,4-diyl)bis(2,1-diazenediyl)]bis[3-hydroxy-N-(2-methoxyphenyl)-
C50H40N6O8 (852.2907480000001)
3,5-dideoxy-5-glycolamido-non-2-ulopyranosylonic acid-(2->3)-beta-D-galacto-hexopyranosyl-(1->4)-2-acetamido-2-deoxy-beta-D-gluco-hexopyranosyl-(1->4)-D-manno-hexopyranose
3,5-dideoxy-5-glycolamido-non-2-ulopyranosylonic acid-(2->3)-beta-D-galacto-hexopyranosyl-(1->4)-2-acetamido-2-deoxy-beta-D-gluco-hexopyranosyl-(1->4)-D-manno-hexopyranose
6-[6-[6-(2,4-dihydroxyphenyl)-2-[3-[(E)-3-(2,4-dihydroxyphenyl)prop-2-enoyl]-2,6-dihydroxyphenyl]-4-methylcyclohex-3-ene-1-carbonyl]-2,2-dimethylchromen-5-yl]oxy-3,4,5-trihydroxyoxane-2-carboxylic acid
6-[6-[6-(2,4-dihydroxyphenyl)-2-[3-[(E)-3-(2,4-dihydroxyphenyl)prop-2-enoyl]-2,6-dihydroxyphenyl]-4-methylcyclohex-3-ene-1-carbonyl]-2,2-dimethylchromen-5-yl]oxy-3,4,5-trihydroxyoxane-2-carboxylic acid
6-[2-[5-(2,4-dihydroxyphenyl)-6-(5-hydroxy-2,2-dimethylchromene-6-carbonyl)-3-methylcyclohex-2-en-1-yl]-4-[(E)-3-(2,4-dihydroxyphenyl)prop-2-enoyl]-3-hydroxyphenoxy]-3,4,5-trihydroxyoxane-2-carboxylic acid
6-[2-[5-(2,4-dihydroxyphenyl)-6-(5-hydroxy-2,2-dimethylchromene-6-carbonyl)-3-methylcyclohex-2-en-1-yl]-4-[(E)-3-(2,4-dihydroxyphenyl)prop-2-enoyl]-3-hydroxyphenoxy]-3,4,5-trihydroxyoxane-2-carboxylic acid
2-({[(2s)-1-{2-amino-3-[1-(8-hydroxy-1,2,3,4-tetrahydroisoquinolin-3-yl)-n-methylformamido]-n-{[(2e)-4-hydroxy-5-(4-hydroxy-2-oxopyrimidin-1-yl)oxolan-2-ylidene]methyl}butanamido}-4-(methylsulfanyl)-1-oxobutan-2-yl]-c-hydroxycarbonimidoyl}amino)-3-(3-hydroxyphenyl)propanoic acid
2-({[(2s)-1-{2-amino-3-[1-(8-hydroxy-1,2,3,4-tetrahydroisoquinolin-3-yl)-n-methylformamido]-n-{[(2e)-4-hydroxy-5-(4-hydroxy-2-oxopyrimidin-1-yl)oxolan-2-ylidene]methyl}butanamido}-4-(methylsulfanyl)-1-oxobutan-2-yl]-c-hydroxycarbonimidoyl}amino)-3-(3-hydroxyphenyl)propanoic acid
(5-{[3-(acetyloxy)-4,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy}-3-hydroxy-4-{[3-(4-hydroxyphenyl)prop-2-enoyl]oxy}-5-({[3-(4-hydroxyphenyl)prop-2-enoyl]oxy}methyl)oxolan-2-yl)methyl 3-(4-hydroxy-3-methoxyphenyl)prop-2-enoate
(5-{[3-(acetyloxy)-4,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy}-3-hydroxy-4-{[3-(4-hydroxyphenyl)prop-2-enoyl]oxy}-5-({[3-(4-hydroxyphenyl)prop-2-enoyl]oxy}methyl)oxolan-2-yl)methyl 3-(4-hydroxy-3-methoxyphenyl)prop-2-enoate
[(2r,3r,4s,5s)-5-{[(2r,3r,4s,5s,6r)-6-[(acetyloxy)methyl]-3,4,5-trihydroxyoxan-2-yl]oxy}-3-hydroxy-4-{[(2e)-3-(4-hydroxyphenyl)prop-2-enoyl]oxy}-5-({[(2e)-3-(4-hydroxyphenyl)prop-2-enoyl]oxy}methyl)oxolan-2-yl]methyl (2e)-3-(4-hydroxy-3-methoxyphenyl)prop-2-enoate
[(2r,3r,4s,5s)-5-{[(2r,3r,4s,5s,6r)-6-[(acetyloxy)methyl]-3,4,5-trihydroxyoxan-2-yl]oxy}-3-hydroxy-4-{[(2e)-3-(4-hydroxyphenyl)prop-2-enoyl]oxy}-5-({[(2e)-3-(4-hydroxyphenyl)prop-2-enoyl]oxy}methyl)oxolan-2-yl]methyl (2e)-3-(4-hydroxy-3-methoxyphenyl)prop-2-enoate
(2e)-1-[(1r,2r,11s)-14-[(3-acetyl-2,4,6-trihydroxy-5-methylphenyl)methyl]-7,9,15-trihydroxy-3,3,8,19,19-pentamethyl-6-[(2e)-3-phenylprop-2-enoyl]-4,12,18-trioxapentacyclo[11.7.1.0²,¹¹.0⁵,¹⁰.0¹⁷,²¹]henicosa-5,7,9,13(21),14,16-hexaen-16-yl]-3-phenylprop-2-en-1-one
(2e)-1-[(1r,2r,11s)-14-[(3-acetyl-2,4,6-trihydroxy-5-methylphenyl)methyl]-7,9,15-trihydroxy-3,3,8,19,19-pentamethyl-6-[(2e)-3-phenylprop-2-enoyl]-4,12,18-trioxapentacyclo[11.7.1.0²,¹¹.0⁵,¹⁰.0¹⁷,²¹]henicosa-5,7,9,13(21),14,16-hexaen-16-yl]-3-phenylprop-2-en-1-one
[(2r,3s,4s,5s)-5-{[(2r,3r,4s,5s,6r)-6-[(acetyloxy)methyl]-3,4,5-trihydroxyoxan-2-yl]oxy}-4-hydroxy-3-{[(2e)-3-(4-hydroxyphenyl)prop-2-enoyl]oxy}-5-({[(2e)-3-(4-hydroxyphenyl)prop-2-enoyl]oxy}methyl)oxolan-2-yl]methyl (2e)-3-(4-hydroxy-3-methoxyphenyl)prop-2-enoate
[(2r,3s,4s,5s)-5-{[(2r,3r,4s,5s,6r)-6-[(acetyloxy)methyl]-3,4,5-trihydroxyoxan-2-yl]oxy}-4-hydroxy-3-{[(2e)-3-(4-hydroxyphenyl)prop-2-enoyl]oxy}-5-({[(2e)-3-(4-hydroxyphenyl)prop-2-enoyl]oxy}methyl)oxolan-2-yl]methyl (2e)-3-(4-hydroxy-3-methoxyphenyl)prop-2-enoate
2-({[(2s)-1-{2-amino-3-[1-(6-hydroxy-1,2,3,4-tetrahydroisoquinolin-3-yl)-n-methylformamido]-n-{[(2e)-4-hydroxy-5-(4-hydroxy-2-oxopyrimidin-1-yl)oxolan-2-ylidene]methyl}butanamido}-4-(methylsulfanyl)-1-oxobutan-2-yl]-c-hydroxycarbonimidoyl}amino)-3-(3-hydroxyphenyl)propanoic acid
2-({[(2s)-1-{2-amino-3-[1-(6-hydroxy-1,2,3,4-tetrahydroisoquinolin-3-yl)-n-methylformamido]-n-{[(2e)-4-hydroxy-5-(4-hydroxy-2-oxopyrimidin-1-yl)oxolan-2-ylidene]methyl}butanamido}-4-(methylsulfanyl)-1-oxobutan-2-yl]-c-hydroxycarbonimidoyl}amino)-3-(3-hydroxyphenyl)propanoic acid
(1s,3s,6s,7e,13r,16s,17s,18s,21s,22r)-17-{[(2r,4r,5s,6r)-5-{[(3-bromo-1h-pyrrol-2-yl)(hydroxy)methylidene]amino}-4-hydroxy-6-methyloxan-2-yl]oxy}-3,22-diethyl-27-hydroxy-6,18-dimethyl-23,25-dioxo-26-oxapentacyclo[22.2.1.0¹,⁶.0¹³,²².0¹⁶,²¹]heptacosa-4,7,14,24(27)-tetraene-4-carboxylic acid
(1s,3s,6s,7e,13r,16s,17s,18s,21s,22r)-17-{[(2r,4r,5s,6r)-5-{[(3-bromo-1h-pyrrol-2-yl)(hydroxy)methylidene]amino}-4-hydroxy-6-methyloxan-2-yl]oxy}-3,22-diethyl-27-hydroxy-6,18-dimethyl-23,25-dioxo-26-oxapentacyclo[22.2.1.0¹,⁶.0¹³,²².0¹⁶,²¹]heptacosa-4,7,14,24(27)-tetraene-4-carboxylic acid
(2s)-2-({[(1r)-1-{[(1r,2r)-2-{1-[(3r)-6-hydroxy-1,2,3,4-tetrahydroisoquinolin-3-yl]-n-methylformamido}-1-({[(2z,4r,5r)-4-hydroxy-5-(4-hydroxy-2-oxopyrimidin-1-yl)oxolan-2-ylidene]methyl}-c-hydroxycarbonimidoyl)propyl]-c-hydroxycarbonimidoyl}-3-(methylsulfanyl)propyl]-c-hydroxycarbonimidoyl}amino)-3-(3-hydroxyphenyl)propanoic acid
(2s)-2-({[(1r)-1-{[(1r,2r)-2-{1-[(3r)-6-hydroxy-1,2,3,4-tetrahydroisoquinolin-3-yl]-n-methylformamido}-1-({[(2z,4r,5r)-4-hydroxy-5-(4-hydroxy-2-oxopyrimidin-1-yl)oxolan-2-ylidene]methyl}-c-hydroxycarbonimidoyl)propyl]-c-hydroxycarbonimidoyl}-3-(methylsulfanyl)propyl]-c-hydroxycarbonimidoyl}amino)-3-(3-hydroxyphenyl)propanoic acid
(2r)-2-({[(1r)-1-{[(1s,2s)-2-{1-[(3r)-8-hydroxy-1,2,3,4-tetrahydroisoquinolin-3-yl]-n-methylformamido}-1-({[(2z,4s,5s)-4-hydroxy-5-(4-hydroxy-2-oxopyrimidin-1-yl)oxolan-2-ylidene]methyl}-c-hydroxycarbonimidoyl)propyl]-c-hydroxycarbonimidoyl}-3-(methylsulfanyl)propyl]-c-hydroxycarbonimidoyl}amino)-3-(3-hydroxyphenyl)propanoic acid
(2r)-2-({[(1r)-1-{[(1s,2s)-2-{1-[(3r)-8-hydroxy-1,2,3,4-tetrahydroisoquinolin-3-yl]-n-methylformamido}-1-({[(2z,4s,5s)-4-hydroxy-5-(4-hydroxy-2-oxopyrimidin-1-yl)oxolan-2-ylidene]methyl}-c-hydroxycarbonimidoyl)propyl]-c-hydroxycarbonimidoyl}-3-(methylsulfanyl)propyl]-c-hydroxycarbonimidoyl}amino)-3-(3-hydroxyphenyl)propanoic acid
1-[(19-{6-[(acetyloxy)methyl]-3-hydroxy-5-(c-hydroxycarbonimidoyloxy)-4-methoxyoxan-2-yl}-21-chloro-10,22-dihydroxy-7,8-dimethoxy-3,13,15-trimethyl-18-oxo-11-oxa-9,19-diazatricyclo[18.3.1.1⁸,¹²]pentacosa-1(23),3,5,9,14,20(24),21-heptaen-16-yl)oxy]-n-methylmethanimidic acid
1-[(19-{6-[(acetyloxy)methyl]-3-hydroxy-5-(c-hydroxycarbonimidoyloxy)-4-methoxyoxan-2-yl}-21-chloro-10,22-dihydroxy-7,8-dimethoxy-3,13,15-trimethyl-18-oxo-11-oxa-9,19-diazatricyclo[18.3.1.1⁸,¹²]pentacosa-1(23),3,5,9,14,20(24),21-heptaen-16-yl)oxy]-n-methylmethanimidic acid
C39H53ClN4O15 (852.3195777999999)
(2s)-2-({[(1s)-1-{[(1s,2s)-2-{1-[(3s)-8-hydroxy-1,2,3,4-tetrahydroisoquinolin-3-yl]-n-methylformamido}-1-({[(2z,4r,5r)-4-hydroxy-5-(4-hydroxy-2-oxopyrimidin-1-yl)oxolan-2-ylidene]methyl}-c-hydroxycarbonimidoyl)propyl]-c-hydroxycarbonimidoyl}-3-(methylsulfanyl)propyl]-c-hydroxycarbonimidoyl}amino)-3-(4-hydroxyphenyl)propanoic acid
(2s)-2-({[(1s)-1-{[(1s,2s)-2-{1-[(3s)-8-hydroxy-1,2,3,4-tetrahydroisoquinolin-3-yl]-n-methylformamido}-1-({[(2z,4r,5r)-4-hydroxy-5-(4-hydroxy-2-oxopyrimidin-1-yl)oxolan-2-ylidene]methyl}-c-hydroxycarbonimidoyl)propyl]-c-hydroxycarbonimidoyl}-3-(methylsulfanyl)propyl]-c-hydroxycarbonimidoyl}amino)-3-(4-hydroxyphenyl)propanoic acid
1-{[(3e,5e,7r,8s,12s,13s,14e)-19-[(2r,3r,4r,5r,6r)-6-[(acetyloxy)methyl]-3-hydroxy-5-(c-hydroxycarbonimidoyloxy)-4-methoxyoxan-2-yl]-21-chloro-10,22-dihydroxy-7,8-dimethoxy-3,13,15-trimethyl-18-oxo-11-oxa-9,19-diazatricyclo[18.3.1.1⁸,¹²]pentacosa-1(23),3,5,9,14,20(24),21-heptaen-16-yl]oxy}-n-methylmethanimidic acid
1-{[(3e,5e,7r,8s,12s,13s,14e)-19-[(2r,3r,4r,5r,6r)-6-[(acetyloxy)methyl]-3-hydroxy-5-(c-hydroxycarbonimidoyloxy)-4-methoxyoxan-2-yl]-21-chloro-10,22-dihydroxy-7,8-dimethoxy-3,13,15-trimethyl-18-oxo-11-oxa-9,19-diazatricyclo[18.3.1.1⁸,¹²]pentacosa-1(23),3,5,9,14,20(24),21-heptaen-16-yl]oxy}-n-methylmethanimidic acid
C39H53ClN4O15 (852.3195777999999)
2-({[1-({2-[1-(6-hydroxy-1,2,3,4-tetrahydroisoquinolin-3-yl)-n-methylformamido]-1-({[4-hydroxy-5-(4-hydroxy-2-oxopyrimidin-1-yl)oxolan-2-ylidene]methyl}-c-hydroxycarbonimidoyl)propyl}-c-hydroxycarbonimidoyl)-3-(methylsulfanyl)propyl]-c-hydroxycarbonimidoyl}amino)-3-(3-hydroxyphenyl)propanoic acid
2-({[1-({2-[1-(6-hydroxy-1,2,3,4-tetrahydroisoquinolin-3-yl)-n-methylformamido]-1-({[4-hydroxy-5-(4-hydroxy-2-oxopyrimidin-1-yl)oxolan-2-ylidene]methyl}-c-hydroxycarbonimidoyl)propyl}-c-hydroxycarbonimidoyl)-3-(methylsulfanyl)propyl]-c-hydroxycarbonimidoyl}amino)-3-(3-hydroxyphenyl)propanoic acid
[5-({6-[(acetyloxy)methyl]-3,4,5-trihydroxyoxan-2-yl}oxy)-3-hydroxy-4-{[3-(4-hydroxyphenyl)prop-2-enoyl]oxy}-5-({[3-(4-hydroxyphenyl)prop-2-enoyl]oxy}methyl)oxolan-2-yl]methyl 3-(4-hydroxy-3-methoxyphenyl)prop-2-enoate
[5-({6-[(acetyloxy)methyl]-3,4,5-trihydroxyoxan-2-yl}oxy)-3-hydroxy-4-{[3-(4-hydroxyphenyl)prop-2-enoyl]oxy}-5-({[3-(4-hydroxyphenyl)prop-2-enoyl]oxy}methyl)oxolan-2-yl]methyl 3-(4-hydroxy-3-methoxyphenyl)prop-2-enoate
2-({[1-({2-[1-(6-hydroxy-1,2,3,4-tetrahydroisoquinolin-3-yl)-n-methylformamido]-1-({[(2e)-4-hydroxy-5-(4-hydroxy-2-oxopyrimidin-1-yl)oxolan-2-ylidene]methyl}-c-hydroxycarbonimidoyl)propyl}-c-hydroxycarbonimidoyl)-3-(methylsulfanyl)propyl]-c-hydroxycarbonimidoyl}amino)-3-(3-hydroxyphenyl)propanoic acid
2-({[1-({2-[1-(6-hydroxy-1,2,3,4-tetrahydroisoquinolin-3-yl)-n-methylformamido]-1-({[(2e)-4-hydroxy-5-(4-hydroxy-2-oxopyrimidin-1-yl)oxolan-2-ylidene]methyl}-c-hydroxycarbonimidoyl)propyl}-c-hydroxycarbonimidoyl)-3-(methylsulfanyl)propyl]-c-hydroxycarbonimidoyl}amino)-3-(3-hydroxyphenyl)propanoic acid
[(2r,3r,4s,5s)-5-{[(2r,3r,4s,5s,6r)-3-(acetyloxy)-4,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy}-3-hydroxy-4-{[(2e)-3-(4-hydroxyphenyl)prop-2-enoyl]oxy}-5-({[(2e)-3-(4-hydroxyphenyl)prop-2-enoyl]oxy}methyl)oxolan-2-yl]methyl (2e)-3-(4-hydroxy-3-methoxyphenyl)prop-2-enoate
[(2r,3r,4s,5s)-5-{[(2r,3r,4s,5s,6r)-3-(acetyloxy)-4,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy}-3-hydroxy-4-{[(2e)-3-(4-hydroxyphenyl)prop-2-enoyl]oxy}-5-({[(2e)-3-(4-hydroxyphenyl)prop-2-enoyl]oxy}methyl)oxolan-2-yl]methyl (2e)-3-(4-hydroxy-3-methoxyphenyl)prop-2-enoate
1-{14-[(3-acetyl-2,4,6-trihydroxy-5-methylphenyl)methyl]-7,9,15-trihydroxy-3,3,8,19,19-pentamethyl-6-(3-phenylprop-2-enoyl)-4,12,18-trioxapentacyclo[11.7.1.0²,¹¹.0⁵,¹⁰.0¹⁷,²¹]henicosa-5,7,9,13(21),14,16-hexaen-16-yl}-3-phenylprop-2-en-1-one
1-{14-[(3-acetyl-2,4,6-trihydroxy-5-methylphenyl)methyl]-7,9,15-trihydroxy-3,3,8,19,19-pentamethyl-6-(3-phenylprop-2-enoyl)-4,12,18-trioxapentacyclo[11.7.1.0²,¹¹.0⁵,¹⁰.0¹⁷,²¹]henicosa-5,7,9,13(21),14,16-hexaen-16-yl}-3-phenylprop-2-en-1-one
(2s)-2-({[(1s)-1-{[(1s,2s)-2-{1-[(3s)-6-hydroxy-1,2,3,4-tetrahydroisoquinolin-3-yl]-n-methylformamido}-1-({[(2z,4r,5r)-4-hydroxy-5-(4-hydroxy-2-oxopyrimidin-1-yl)oxolan-2-ylidene]methyl}-c-hydroxycarbonimidoyl)propyl]-c-hydroxycarbonimidoyl}-3-(methylsulfanyl)propyl]-c-hydroxycarbonimidoyl}amino)-3-(4-hydroxyphenyl)propanoic acid
(2s)-2-({[(1s)-1-{[(1s,2s)-2-{1-[(3s)-6-hydroxy-1,2,3,4-tetrahydroisoquinolin-3-yl]-n-methylformamido}-1-({[(2z,4r,5r)-4-hydroxy-5-(4-hydroxy-2-oxopyrimidin-1-yl)oxolan-2-ylidene]methyl}-c-hydroxycarbonimidoyl)propyl]-c-hydroxycarbonimidoyl}-3-(methylsulfanyl)propyl]-c-hydroxycarbonimidoyl}amino)-3-(4-hydroxyphenyl)propanoic acid
[(2r,3s,4s,5s)-5-{[(2r,3r,4s,5s,6r)-3-(acetyloxy)-4,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy}-4-hydroxy-3-{[(2e)-3-(4-hydroxyphenyl)prop-2-enoyl]oxy}-5-({[(2e)-3-(4-hydroxyphenyl)prop-2-enoyl]oxy}methyl)oxolan-2-yl]methyl (2e)-3-(4-hydroxy-3-methoxyphenyl)prop-2-enoate
[(2r,3s,4s,5s)-5-{[(2r,3r,4s,5s,6r)-3-(acetyloxy)-4,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy}-4-hydroxy-3-{[(2e)-3-(4-hydroxyphenyl)prop-2-enoyl]oxy}-5-({[(2e)-3-(4-hydroxyphenyl)prop-2-enoyl]oxy}methyl)oxolan-2-yl]methyl (2e)-3-(4-hydroxy-3-methoxyphenyl)prop-2-enoate
(2e)-1-{14-[(3-acetyl-2,4,6-trihydroxy-5-methylphenyl)methyl]-7,9,15-trihydroxy-3,3,8,19,19-pentamethyl-6-[(2e)-3-phenylprop-2-enoyl]-4,12,18-trioxapentacyclo[11.7.1.0²,¹¹.0⁵,¹⁰.0¹⁷,²¹]henicosa-5,7,9,13(21),14,16-hexaen-16-yl}-3-phenylprop-2-en-1-one
(2e)-1-{14-[(3-acetyl-2,4,6-trihydroxy-5-methylphenyl)methyl]-7,9,15-trihydroxy-3,3,8,19,19-pentamethyl-6-[(2e)-3-phenylprop-2-enoyl]-4,12,18-trioxapentacyclo[11.7.1.0²,¹¹.0⁵,¹⁰.0¹⁷,²¹]henicosa-5,7,9,13(21),14,16-hexaen-16-yl}-3-phenylprop-2-en-1-one