NCBI Taxonomy: 290882

5,8,9-trihydroxy-10-propyl-3,4,5,8,9,10-hexahydrooxecin-2-one

C12H20O5 (244.13106700000003)

(4ar,6s,8as)-6-(3-hydroxyprop-1-en-2-yl)-4,8a-dimethyl-1,4a,5,6,7,8-hexahydronaphthalen-2-one

C15H22O2 (234.1619712)

(2r,3r)-3-hydroxy-2-propyl-hexahydro-2h-1-benzopyran-4,5-dione

C12H18O4 (226.1205028)

(1's,2s,3s,3'r,5r,7'r,9'e,11'r)-3,3',14'-trimethyl-5-(2-methylprop-1-en-1-yl)-12'-oxospiro[oxolane-2,6'-tricyclo[9.3.0.0³,⁷]tetradecane]-9',13'-diene-10'-carbaldehyde

C25H34O3 (382.25078140000005)

(1s,2r,3as,5r,7s,7ar)-2-[(2e)-but-2-enoyl]-1-{[(1s,5s,6s)-4'-chloro-3'-[(1s,2s,3r)-5-chloro-2-methyl-4,7-dioxo-6-[(1e)-prop-1-en-1-yl]spiro[2.4]hept-5-en-1-yl]-1-hexyl-2-hydroxy-2',4,5'-trioxo-3-azaspiro[bicyclo[3.1.0]hexane-6,1'-cyclopentane]-2,3'-dien-5-yl]carbonyl}-2-hydroxy-7-methyl-octahydroindene-5-carboxylic acid

(1s,2r,3as,5r,7s,7ar)-2-[(2e)-but-2-enoyl]-1-{[(1s,5s,6s)-4'-chloro-3'-[(1s,2s,3r)-5-chloro-2-methyl-4,7-dioxo-6-[(1e)-prop-1-en-1-yl]spiro[2.4]hept-5-en-1-yl]-1-hexyl-2-hydroxy-2',4,5'-trioxo-3-azaspiro[bicyclo[3.1.0]hexane-6,1'-cyclopentane]-2,3'-dien-5-yl]carbonyl}-2-hydroxy-7-methyl-octahydroindene-5-carboxylic acid

(6s,7r)-7-hydroxy-3-(7-hydroxy-2,2-dimethylchromen-8-yl)-6-methyl-6,7-dihydro-5h-2-benzofuran-4-one

C20H20O5 (340.13106700000003)

15-hydroxy-6-methoxy-8,12,13,13-tetramethyl-4,11-dioxatetracyclo[7.6.1.0⁵,¹⁶.0¹⁰,¹⁴]hexadeca-1(16),5,7,9,14-pentaene-2,3-dione

(8r,16s,18s,26r,34s,36s)-8,16,18,26,34,36-hexahydroxyhentetracontane-2,6,10,14,24,28,32-heptone

C41H70O13 (770.481617)

(4as,5r,8s,8as)-8-hydroxy-4-oxo-4a,5,8,8a-tetrahydro-2',4'-dioxaspiro[naphthalene-1,3'-tricyclo[7.3.1.0⁵,¹³]tridecane]-1'(13'),5',7',9',11'-pentaen-5-yl acetate

(4r,5r,6r,10r)-4,6-dihydroxy-10-methyl-3-methylidene-2-oxaspiro[4.5]dec-8-ene-1,7-dione

5-(acetyloxy)-n-{3-[(2s,5s)-3,6-dihydroxy-5-{3-[(1-hydroxyethylidene)amino]propyl}-2,5-dihydropyrazin-2-yl]propyl}-3-methylpent-2-enimidic acid

C20H32N4O6 (424.2321732)

(6e,9r,10r)-9-hydroxy-10-isopropyl-4,5,9,10-tetrahydro-3h-oxecine-2,8-dione

C12H18O4 (226.1205028)

2-chloro-4-hydroxy-3-(prop-1-en-1-yl)cyclopent-2-en-1-one

C8H9ClO2 (172.02910440000002)

7-hydroxy-10-methyl-7,8,9,10-tetrahydrooxecin-2-one

C10H14O3 (182.0942894)

5-hydroxy-4-oxo-4a,5,8,8a-tetrahydro-2',4'-dioxaspiro[naphthalene-1,3'-tricyclo[7.3.1.0⁵,¹³]tridecane]-1'(13'),5',7',9',11'-pentaen-8-yl acetate

10-heptyl-7,8-dihydroxy-2-oxo-3,4,7,8,9,10-hexahydrooxecin-4-yl 3-hydroxy-2-methylbutanoate

C21H36O7 (400.2460906)

(6e,8r,10s)-8-hydroxy-10-propyl-3,4,5,8,9,10-hexahydrooxecin-2-one

C12H20O3 (212.14123700000002)

4,9,10-trihydroxy-6-methyl-3-methylidene-2-oxaspiro[4.5]dec-7-en-1-one

7-hydroxy-2-methyl-3,11-dioxabicyclo[8.1.0]undeca-5,8-dien-4-one

(1s,2r,3as,5r,7s,7ar)-2-[(2e)-but-2-enoyl]-1-{[(1s,5s,6s)-4'-chloro-3'-[(1r,2r,3s)-5-chloro-2-methyl-4,7-dioxo-6-[(1e)-prop-1-en-1-yl]spiro[2.4]hept-5-en-1-yl]-1-hexyl-2-hydroxy-2',4,5'-trioxo-3-azaspiro[bicyclo[3.1.0]hexane-6,1'-cyclopentane]-2,3'-dien-5-yl]carbonyl}-2-hydroxy-7-methyl-octahydroindene-5-carboxylic acid

(1s,2r,3as,5r,7s,7ar)-2-[(2e)-but-2-enoyl]-1-{[(1s,5s,6s)-4'-chloro-3'-[(1r,2r,3s)-5-chloro-2-methyl-4,7-dioxo-6-[(1e)-prop-1-en-1-yl]spiro[2.4]hept-5-en-1-yl]-1-hexyl-2-hydroxy-2',4,5'-trioxo-3-azaspiro[bicyclo[3.1.0]hexane-6,1'-cyclopentane]-2,3'-dien-5-yl]carbonyl}-2-hydroxy-7-methyl-octahydroindene-5-carboxylic acid

(8r,16s,26r,34s,36s)-8,16,26,34,36-pentahydroxyhentetracontan-2,6,10,14,18,24,28,32-octone

C41H68O13 (768.4659678)

(1r,2s,7s,10s)-7-hydroxy-2-methyl-3,11-dioxabicyclo[8.1.0]undec-8-en-4-one

C10H14O4 (198.0892044)

(2e,4s)-4-hydroxy-2-methyl-5-[(1r,3s,6r)-6-methyl-7-oxatricyclo[4.3.0.0³,⁹]nonan-9-yl]pent-2-enoic acid

C15H22O4 (266.1518012)

(4s,5s,6s,10s)-4,6-dihydroxy-10-methyl-3-methylidene-2-oxaspiro[4.5]dec-8-ene-1,7-dione

(4r,4ar,5r,8s,8as)-4,8-dihydroxy-4a,5,8,8a-tetrahydro-4h-2',4'-dioxaspiro[naphthalene-1,3'-tricyclo[7.3.1.0⁵,¹³]tridecane]-1'(13'),5',7',9',11'-pentaen-5-yl acetate

C22H20O6 (380.125982)

(1s,2r,3as,5r,7s,7ar)-2-[(2e)-but-2-enoyl]-1-{[(1s,5s,6s)-4'-chloro-3'-[(1r,2r,3r)-5-chloro-2-methyl-4,7-dioxo-6-[(1e)-prop-1-en-1-yl]spiro[2.4]hept-5-en-1-yl]-1-hexyl-2-hydroxy-2',4,5'-trioxo-3-azaspiro[bicyclo[3.1.0]hexane-6,1'-cyclopentane]-2,3'-dien-5-yl]carbonyl}-2-hydroxy-7-methyl-octahydroindene-5-carboxylic acid

(1s,2r,3as,5r,7s,7ar)-2-[(2e)-but-2-enoyl]-1-{[(1s,5s,6s)-4'-chloro-3'-[(1r,2r,3r)-5-chloro-2-methyl-4,7-dioxo-6-[(1e)-prop-1-en-1-yl]spiro[2.4]hept-5-en-1-yl]-1-hexyl-2-hydroxy-2',4,5'-trioxo-3-azaspiro[bicyclo[3.1.0]hexane-6,1'-cyclopentane]-2,3'-dien-5-yl]carbonyl}-2-hydroxy-7-methyl-octahydroindene-5-carboxylic acid

6-(3-hydroxyprop-1-en-2-yl)-4,8a-dimethyl-2,4a,5,6,7,8-hexahydro-1h-naphthalen-2-ol

C15H24O2 (236.1776204)

(4as,5s,8r,8as)-5,8-dihydroxy-4a,5,6,7,8,8a-hexahydro-2',4'-dioxaspiro[naphthalene-1,3'-tricyclo[7.3.1.0⁵,¹³]tridecane]-1'(13'),5',7',9',11'-pentaen-4-one

C20H18O5 (338.1154178)

(2s)-2-hydroxy-1-(5-hydroxy-2-methylphenyl)propan-1-one

C10H12O3 (180.0786402)

3,4-dihydroxy-7-methyl-2-(prop-1-en-1-yl)-2h,3h,4h,7h-furo[3,4-b]pyran-5-one

C21H29NO4 (359.20964740000005)

8,16,26,34,36-pentahydroxyhentetracontan-2,6,10,14,18,24,28,32-octone

C41H68O13 (768.4659678)

(2e,4s)-4-hydroxy-5-[(1s,5s,6s)-6-(hydroxymethyl)-2-methylidenebicyclo[3.1.1]heptan-6-yl]-2-methylpent-2-enoic acid

C15H22O4 (266.1518012)

4,8-dihydroxy-4a,5,8,8a-tetrahydro-4h-2',4'-dioxaspiro[naphthalene-1,3'-tricyclo[7.3.1.0⁵,¹³]tridecane]-1'(13'),5',7',9',11'-pentaen-5-yl acetate

C22H20O6 (380.125982)

3,5-dihydroxy-4-(1,3,6-trimethyl-2-propyl-4a,5,6,7,8,8a-hexahydro-2h-naphthalene-1-carbonyl)pyrrol-2-one

2-{2-[(1,4-dihydroxy-2-{[hydroxy(phenyl)methylidene]amino}butylidene)amino]-n-methylpropanamido}-4-methylpentanoic acid

C21H31N3O6 (421.2212746)

2,4-dihydroxy-8,12,13,13-tetramethyl-3,11-dioxatetracyclo[7.6.1.0⁵,¹⁶.0¹⁰,¹⁴]hexadeca-1,4,7,9(16),10(14)-pentaene-6,15-dione

(2e,4s)-4-hydroxy-2-methyl-5-[(1r,3s,6s,9s)-6-methyl-7-oxatricyclo[4.3.0.0³,⁹]nonan-9-yl]pent-2-enoic acid

C15H22O4 (266.1518012)

(1r,2r,5z,7r,8e,10s)-7-hydroxy-2-methyl-3,11-dioxabicyclo[8.1.0]undeca-5,8-dien-4-one

(1s,2r,3as,5r,7s,7ar)-2-[(2e)-but-2-enoyl]-1-{[(1s,5s,6s)-4'-chloro-3'-[(1s,2s,3s)-5-chloro-2-methyl-4,7-dioxo-6-[(1e)-prop-1-en-1-yl]spiro[2.4]hept-5-en-1-yl]-1-hexyl-2-hydroxy-2',4,5'-trioxo-3-azaspiro[bicyclo[3.1.0]hexane-6,1'-cyclopentane]-2,3'-dien-5-yl]carbonyl}-2-hydroxy-7-methyl-octahydroindene-5-carboxylic acid

(1s,2r,3as,5r,7s,7ar)-2-[(2e)-but-2-enoyl]-1-{[(1s,5s,6s)-4'-chloro-3'-[(1s,2s,3s)-5-chloro-2-methyl-4,7-dioxo-6-[(1e)-prop-1-en-1-yl]spiro[2.4]hept-5-en-1-yl]-1-hexyl-2-hydroxy-2',4,5'-trioxo-3-azaspiro[bicyclo[3.1.0]hexane-6,1'-cyclopentane]-2,3'-dien-5-yl]carbonyl}-2-hydroxy-7-methyl-octahydroindene-5-carboxylic acid

(12s)-15-hydroxy-6-methoxy-8,12,13,13-tetramethyl-3,11-dioxatetracyclo[7.6.1.0⁵,¹⁶.0¹⁰,¹⁴]hexadeca-1(16),5,7,9,14-pentaene-2,4-dione

(12s)-15-hydroxy-6-methoxy-8,12,13,13-tetramethyl-4,11-dioxatetracyclo[7.6.1.0⁵,¹⁶.0¹⁰,¹⁴]hexadeca-1(16),5,7,9,14-pentaene-2,3-dione

(1s,5s,6s)-5-hydroxy-4-(hydroxymethyl)-1-(3-methylbut-2-en-1-yl)-3-[(1e,3e)-penta-1,3-dien-1-yl]-7-oxabicyclo[4.1.0]hept-3-en-2-one

C17H22O4 (290.1518012)

(4s,5r,6r,10r)-4,6-dihydroxy-10-methyl-3-methylidene-2-oxaspiro[4.5]dec-8-ene-1,7-dione

C8H10Cl2O2 (208.00578200000004)

(5r,6e,8r,9r,10r)-5,8,9-trihydroxy-10-isopropyl-3,4,5,8,9,10-hexahydrooxecin-2-one

C12H20O5 (244.13106700000003)

(4s)-2-chloro-4-hydroxy-3-[(1e)-prop-1-en-1-yl]cyclopent-2-en-1-one

C8H9ClO2 (172.02910440000002)

5-(acetyloxy)-n-[3-(3,6-dihydroxy-5-{3-[(1-hydroxyethylidene)amino]propyl}-2,5-dihydropyrazin-2-yl)propyl]-3-methylpent-2-enimidic acid

C20H32N4O6 (424.2321732)

(2s)-2-[(2r)-2-{[(2s)-1,4-dihydroxy-2-{[hydroxy(phenyl)methylidene]amino}butylidene]amino}-n-methylpropanamido]-4-methylpentanoic acid

C21H31N3O6 (421.2212746)

(1r,2s,3r)-2,4-dichloro-5-[(1e)-prop-1-en-1-yl]cyclopent-4-ene-1,3-diol

(4as,5s,8r,8as)-5-hydroxy-4-oxo-4a,5,8,8a-tetrahydro-2',4'-dioxaspiro[naphthalene-1,3'-tricyclo[7.3.1.0⁵,¹³]tridecane]-1'(13'),5',7',9',11'-pentaen-8-yl acetate

7-hydroxy-3-(7-hydroxy-2,2-dimethylchromen-8-yl)-6-methyl-6,7-dihydro-5h-2-benzofuran-4-one

C20H20O5 (340.13106700000003)

(1r,5r,7r,10r,11s)-10-hydroxy-11-methyl-4-methylidene-3,6-dioxatricyclo[5.3.1.0¹,⁵]undecane-2,9-dione

(1s,5r,6s)-5-hydroxy-4-(hydroxymethyl)-1-(3-methylbut-2-en-1-yl)-3-[(1e,3e)-penta-1,3-dien-1-yl]-7-oxabicyclo[4.1.0]hept-3-en-2-one

C17H22O4 (290.1518012)

15-hydroxy-6-methoxy-8,12,13,13-tetramethyl-3,11-dioxatetracyclo[7.6.1.0⁵,¹⁶.0¹⁰,¹⁴]hexadeca-1(16),5,7,9,14-pentaene-2,4-dione

(2e)-3-[(3r)-3-nonyloxiran-2-yl]-1-[(3r,4s,5s)-2,3,4-trihydroxy-5-(hydroxymethyl)-4,5-dihydropyrrol-3-yl]prop-2-en-1-one

C19H31NO6 (369.2151266)

6-hydroxy-10-methyl-3,4,5,6,9,10-hexahydrooxecin-2-one

C10H16O3 (184.1099386)

(12s)-6,15-dihydroxy-8,12,13,13-tetramethyl-4,11-dioxatetracyclo[7.6.1.0⁵,¹⁶.0¹⁰,¹⁴]hexadeca-1(16),5,7,9,14-pentaene-2,3-dione

3-hydroxy-2-(7-hydroxy-2,2-dimethylchromene-8-carbonyl)-6-methoxy-5-methylbenzaldehyde

C21H20O6 (368.125982)

(4r,5r,6r,10r)-4,6-dihydroxy-10-methyl-3-methylidene-2-oxaspiro[4.5]decane-1,7-dione

5,8-dihydroxy-4a,5,8,8a-tetrahydro-2',4'-dioxaspiro[naphthalene-1,3'-tricyclo[7.3.1.0⁵,¹³]tridecane]-1'(13'),5',7',9',11'-pentaen-4-one

C20H16O5 (336.0997686)

4-hydroxy-3-(prop-1-en-1-yl)cyclopent-2-en-1-one

C8H10O2 (138.06807600000002)

(4s,4ar,5s,8r,8as)-4,8-dihydroxy-4a,5,8,8a-tetrahydro-4h-2',4'-dioxaspiro[naphthalene-1,3'-tricyclo[7.3.1.0⁵,¹³]tridecane]-1'(13'),5',7',9',11'-pentaen-5-yl acetate

C22H20O6 (380.125982)

(1s,5s,7r,9s,10r,11s)-9,10-dihydroxy-11-methyl-4-methylidene-3,6-dioxatricyclo[5.3.1.0¹,⁵]undecan-2-one

(2s,3r,4s,7s)-3,4-dihydroxy-7-methyl-2-[(1e)-prop-1-en-1-yl]-2h,3h,4h,7h-furo[3,4-b]pyran-5-one

(4r,5r,6s,10r)-4,6-dihydroxy-10-methyl-3-methylidene-2-oxaspiro[4.5]dec-8-ene-1,7-dione

stagonolide h

C34H40ClNO9 (641.2391460000001)

(1s,2r,3as,5r,7s,7ar)-2-[(2e)-but-2-enoyl]-1-{[(1s,5s,6s)-4'-chloro-1-hexyl-2-hydroxy-2',4,5'-trioxo-3'-[(1e)-prop-1-en-1-yl]-3-azaspiro[bicyclo[3.1.0]hexane-6,1'-cyclopentane]-2,3'-dien-5-yl]carbonyl}-2-hydroxy-7-methyl-octahydroindene-5-carboxylic acid

(1s,2r,3as,5r,7s,7ar)-2-[(2e)-but-2-enoyl]-1-{[(1s,5s,6s)-4'-chloro-1-hexyl-2-hydroxy-2',4,5'-trioxo-3'-[(1e)-prop-1-en-1-yl]-3-azaspiro[bicyclo[3.1.0]hexane-6,1'-cyclopentane]-2,3'-dien-5-yl]carbonyl}-2-hydroxy-7-methyl-octahydroindene-5-carboxylic acid

(2r,4ar,6s,8as)-6-(3-hydroxyprop-1-en-2-yl)-4,8a-dimethyl-2,4a,5,6,7,8-hexahydro-1h-naphthalen-2-ol

C15H24O2 (236.1776204)

(4s)-4-hydroxy-3-[(1e)-prop-1-en-1-yl]cyclopent-2-en-1-one

C8H10O2 (138.06807600000002)

7-hydroxy-2-methyl-3,11-dioxabicyclo[8.1.0]undec-8-en-4-one

C10H14O4 (198.0892044)

5-hydroxy-4-(hydroxymethyl)-1-(3-methylbut-2-en-1-yl)-3-(penta-1,3-dien-1-yl)-7-oxabicyclo[4.1.0]hept-3-en-2-one

C17H22O4 (290.1518012)

(2s,3r)-2-{[(2s)-2-[(2r)-2-{[(2s)-1,4-dihydroxy-2-{[hydroxy(phenyl)methylidene]amino}butylidene]amino}-n-methylpropanamido]-1-hydroxy-4-methylpentylidene]amino}-3-methylpentanoic acid

C27H42N4O7 (534.3053342000001)

2-[3-chloro-2,4-dihydroxy-6-(methoxycarbonyl)phenoxy]-6-hydroxy-4-methylbenzoic acid

C16H13ClO8 (368.0298928)

pyrenolide a

C26H40N4O8 (536.2846000000001)

5-(acetyloxy)-n-{3-[5-(3-{[5-(acetyloxy)-1-hydroxy-3-methylpent-2-en-1-ylidene]amino}propyl)-3,6-dihydroxy-2,5-dihydropyrazin-2-yl]propyl}-3-methylpent-2-enimidic acid

5-hydroxy-2-(2-hydroxypropan-2-yl)-4a,10a-dimethyl-8-(4-methyl-3-oxohex-4-en-2-yl)-2,3,4,4b,5,11,12,12a-octahydro-1,10-dioxatetraphene-6,9-dione

C28H38O7 (486.2617398)

(1's,2s,3s,3'r,5r,7'r,9'e,11'r,14'r)-14'-hydroxy-3,3',14'-trimethyl-5-(2-methylprop-1-en-1-yl)-12'-oxospiro[oxolane-2,6'-tricyclo[9.3.0.0³,⁷]tetradecan]-9'-ene-10'-carbaldehyde

C25H36O4 (400.2613456)

(1s,3r)-4-chloro-5-[(1e)-prop-1-en-1-yl]cyclopent-4-ene-1,3-diol

C8H11ClO2 (174.0447536)

5,8-dihydroxy-4a,5,6,7,8,8a-hexahydro-2',4'-dioxaspiro[naphthalene-1,3'-tricyclo[7.3.1.0⁵,¹³]tridecane]-1'(13'),5',7',9',11'-pentaen-4-one

C20H18O5 (338.1154178)

(4as,5r,8s,8as)-5-hydroxy-4-oxo-4a,5,8,8a-tetrahydro-2',4'-dioxaspiro[naphthalene-1,3'-tricyclo[7.3.1.0⁵,¹³]tridecane]-1'(13'),5',7',9',11'-pentaen-8-yl acetate

6,15-dihydroxy-8,12,13,13-tetramethyl-4,11-dioxatetracyclo[7.6.1.0⁵,¹⁶.0¹⁰,¹⁴]hexadeca-1(16),5,7,9,14-pentaene-2,3-dione

(4r,5r,6s,9r,10s)-4,9,10-trihydroxy-6-methyl-3-methylidene-2-oxaspiro[4.5]dec-7-en-1-one

(4s,5e,7r,8s,10r)-10-heptyl-7,8-dihydroxy-2-oxo-3,4,7,8,9,10-hexahydrooxecin-4-yl (2s,3s)-3-hydroxy-2-methylbutanoate

C21H36O7 (400.2460906)

6-(3-hydroxyprop-1-en-2-yl)-4,8a-dimethyl-1,4a,5,6,7,8-hexahydronaphthalen-2-one

C15H22O2 (234.1619712)

5,9-dihydroxy-10-methyl-3,4,5,6,9,10-hexahydrooxecin-2-one

C10H16O4 (200.10485359999998)

10-hydroxy-11-methyl-4-methylidene-3,6-dioxatricyclo[5.3.1.0¹,⁵]undecane-2,9-dione

5-(acetyloxy)-n-{3-[(2s,5s)-5-{3-[(1,5-dihydroxy-3-methylpent-2-en-1-ylidene)amino]propyl}-3,6-dihydroxy-2,5-dihydropyrazin-2-yl]propyl}-3-methylpent-2-enimidic acid

C24H38N4O7 (494.2740358)

(6e,8s,9r,10s)-8,9-dihydroxy-10-propyl-3,4,5,8,9,10-hexahydrooxecin-2-one

C12H20O4 (228.136152)

(12s)-2,4-dihydroxy-8,12,13,13-tetramethyl-3,11-dioxatetracyclo[7.6.1.0⁵,¹⁶.0¹⁰,¹⁴]hexadeca-1,4,7,9(16),10(14)-pentaene-6,15-dione

C34H40ClNO9 (641.2391460000001)

2-(but-2-enoyl)-1-{[4'-chloro-1-hexyl-2-hydroxy-2',4,5'-trioxo-3'-(prop-1-en-1-yl)-3-azaspiro[bicyclo[3.1.0]hexane-6,1'-cyclopentane]-2,3'-dien-5-yl]carbonyl}-2-hydroxy-7-methyl-octahydroindene-5-carboxylic acid

2-(but-2-enoyl)-1-{[4'-chloro-1-hexyl-2-hydroxy-2',4,5'-trioxo-3'-(prop-1-en-1-yl)-3-azaspiro[bicyclo[3.1.0]hexane-6,1'-cyclopentane]-2,3'-dien-5-yl]carbonyl}-2-hydroxy-7-methyl-octahydroindene-5-carboxylic acid

(1r,10r,11s)-10-hydroxy-11-methyl-4-methylidene-3,6-dioxatricyclo[5.3.1.0¹,⁵]undecane-2,9-dione