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—— [6-[[6-(5,5-Dimethyloxolan-2-yl)-5,10-dihydroxy-2,6,13,17,17-pentamethyl-8-oxo-7-oxapentacyclo[10.8.0.02,9.05,9.013,18]icos-11-en-16-yl]oxy]-4-hydroxy-5-(3,4,5-trihydroxy-6-methyloxan-2-yl)oxyoxan-3-yl] hydrogen sulfate —— C41H64O17S
[6-[[6-(5,5-Dimethyloxolan-2-yl)-5,10-dihydroxy-2,6,13,17,17-pentamethyl-8-oxo-7-oxapentacyclo[10.8.0.02,9.05,9.013,18]icos-11-en-16-yl]oxy]-4-hydroxy-5-(3,4,5-trihydroxy-6-methyloxan-2-yl)oxyoxan-3-yl] hydrogen sulfate
—— (6-Hydroxy-12-methyl-2,5-dioxo-oxacyclododec-3-yl) 4,11-dihydroxydodec-2-enoate —— C24H40O8
(6-Hydroxy-12-methyl-2,5-dioxo-oxacyclododec-3-yl) 4,11-dihydroxydodec-2-enoate
—— 6-hydroxy-2-(10-hydroxy-3,7,9,11-tetramethyltrideca-2,5,7,11-tetraen-1-yl)-3-methyl-4H-pyran-4-one —— C23H32O4
6-hydroxy-2-(10-hydroxy-3,7,9,11-tetramethyltrideca-2,5,7,11-tetraen-1-yl)-3-methyl-4H-pyran-4-one
—— 6,7-dihydroxy-2,4b,8,8-tetramethyl-4,4a,5,6,7,8a,9,10-octahydro-3H-phenanthrene-2-carboxylic acid —— C19H30O4
6,7-dihydroxy-2,4b,8,8-tetramethyl-4,4a,5,6,7,8a,9,10-octahydro-3H-phenanthrene-2-carboxylic acid
—— 6-Hydroxy-3,5,7,4'-tetramethoxyflavone —— C19H18O7
6-Hydroxy-3,5,7,4'-tetramethoxyflavone
—— 6-hydroxy-2,2-dimethyl-3‑chromen 19012-99-8 C11H12O2
6-hydroxy-2,2-dimethyl-3‑chromen
—— 6-[4,5-Dihydroxy-4,6-dimethyl-7-(2,4,5-trimethyl-3,6-dioxabicyclo[3.1.0]hexan-2-yl)hepta-2,6-dien-2-yl]-4-methoxy-5-methylpyran-2-one —— C23H32O7
6-[4,5-Dihydroxy-4,6-dimethyl-7-(2,4,5-trimethyl-3,6-dioxabicyclo[3.1.0]hexan-2-yl)hepta-2,6-dien-2-yl]-4-methoxy-5-methylpyran-2-one
—— 6-Methylideneimidazo[1,5-b]pyrazol-4-one —— C6H5N3O
6-Methylideneimidazo[1,5-b]pyrazol-4-one
—— [6-[4-[5-[4,5-dihydroxy-6-methyl-3-(3,4,5-trihydroxy-6-methyloxan-2-yl)oxyoxan-2-yl]oxy-4-hydroxy-6-methyl-3-(3,4,5-trihydroxy-6-methyloxan-2-yl)oxyoxan-2-yl]oxy-3,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-17-[1-hydroxy-1-[3-(2-methylpentan-3-yl)oxiran-2-yl]ethyl]-10,13-dimethyl-2,3,4,5,6,7,8,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-3-yl] hydrogen sulfate —— C59H98O28S
[6-[4-[5-[4,5-dihydroxy-6-methyl-3-(3,4,5-trihydroxy-6-methyloxan-2-yl)oxyoxan-2-yl]oxy-4-hydroxy-6-methyl-3-(3,4,5-trihydroxy-6-methyloxan-2-yl)oxyoxan-2-yl]oxy-3,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-17-[1-hydroxy-1-[3-(2-methylpentan-3-yl)oxiran-2-yl]ethyl]-10,13-dimethyl-2,3,4,5,6,7,8,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-3-yl] hydrogen sulfate
—— 6-(3,4,4a,5,6,6a,10a,10b-octahydro-2H-benzo[h]chromen-2-yl)-6-hydroxy-20-[(2-hydroxyethylamino)methyl]-9-methyl-16-methylimino-15,17-diazapentacyclo[15.3.1.01,8.02,11.04,8]henicosa-4,18-dien-12-yne-5-carboxylic acid —— C38H50N4O5
6-(3,4,4a,5,6,6a,10a,10b-octahydro-2H-benzo[h]chromen-2-yl)-6-hydroxy-20-[(2-hydroxyethylamino)methyl]-9-methyl-16-methylimino-15,17-diazapentacyclo[15.3.1.01,8.02,11.04,8]henicosa-4,18-dien-12-yne-5-carboxylic acid
—— [6-[3-[2-(3,4-Dihydroxyphenyl)ethenyl]-5-hydroxyphenoxy]-3,4,5-trihydroxyoxan-2-yl]methyl 3,4,5-trihydroxybenzoate —— C27H26O13
[6-[3-[2-(3,4-Dihydroxyphenyl)ethenyl]-5-hydroxyphenoxy]-3,4,5-trihydroxyoxan-2-yl]methyl 3,4,5-trihydroxybenzoate
—— 6-[(5-Hydroxy-8-methoxy-2,6-dimethyl-3,4-dihydrochromen-2-yl)methyl]-5-(2-hydroxy-2-methylpropyl)-3a,7a-dimethyl-1,2,3,7-tetrahydroinden-4-one —— C28H40O5
6-[(5-Hydroxy-8-methoxy-2,6-dimethyl-3,4-dihydrochromen-2-yl)methyl]-5-(2-hydroxy-2-methylpropyl)-3a,7a-dimethyl-1,2,3,7-tetrahydroinden-4-one
—— 6-Acetyl-2-[1-[[3-(furan-2-ylmethoxy)-2-hydroxypropyl]amino]ethylidene]-7,9-dihydroxy-8,9b-dimethyldibenzofuran-1,3-dione —— C26H27NO9
6-Acetyl-2-[1-[[3-(furan-2-ylmethoxy)-2-hydroxypropyl]amino]ethylidene]-7,9-dihydroxy-8,9b-dimethyldibenzofuran-1,3-dione
—— [6-(4-Ethyl-4-methyl-2-oxooxolan-3-yl)oxy-5-hydroxy-2-(hydroxymethyl)-4-(2-methylbut-2-enoyloxy)oxan-3-yl] 2-methylbut-2-enoate —— C23H34O10
[6-(4-Ethyl-4-methyl-2-oxooxolan-3-yl)oxy-5-hydroxy-2-(hydroxymethyl)-4-(2-methylbut-2-enoyloxy)oxan-3-yl] 2-methylbut-2-enoate
—— [6-[2-(3,4-Dihydroxyphenyl)ethoxy]-2-(hydroxymethyl)-4-(3,4,5-trihydroxy-6-methyloxan-2-yl)oxy-5-(3,4,5-trihydroxyoxan-2-yl)oxyoxan-3-yl] 3-(3,4-dihydroxyphenyl)prop-2-enoate —— C34H44O19
[6-[2-(3,4-Dihydroxyphenyl)ethoxy]-2-(hydroxymethyl)-4-(3,4,5-trihydroxy-6-methyloxan-2-yl)oxy-5-(3,4,5-trihydroxyoxan-2-yl)oxyoxan-3-yl] 3-(3,4-dihydroxyphenyl)prop-2-enoate
—— 6-Butylidene-16-(4-hydroxybutylidene)-12-(5-hydroxy-2-phenylphenyl)-5,15-dioxapentacyclo[9.5.2.01,13.02,10.03,7]octadeca-3(7),12-diene-4,14-dione —— C36H36O6
6-Butylidene-16-(4-hydroxybutylidene)-12-(5-hydroxy-2-phenylphenyl)-5,15-dioxapentacyclo[9.5.2.01,13.02,10.03,7]octadeca-3(7),12-diene-4,14-dione
—— 6-hydroxy-18-(1H-indol-3-ylmethyl)-7,9,15,16-tetramethyl-19-azatricyclo[11.7.0.01,17]icosa-3,7,11-triene-2,5,14,20-tetrone —— C32H36N2O5
6-hydroxy-18-(1H-indol-3-ylmethyl)-7,9,15,16-tetramethyl-19-azatricyclo[11.7.0.01,17]icosa-3,7,11-triene-2,5,14,20-tetrone
—— [6-[[5-(4-Amino-2-oxopyrimidin-1-yl)-3-hydroxyoxolan-2-yl]methoxymethoxy]-3,4,5-trihydroxyoxan-2-yl]methyl [3-hydroxy-5-(5-methyl-2,4-dioxopyrimidin-1-yl)oxolan-2-yl]methyl hydrogen phosphate —— C26H38N5O17P
[6-[[5-(4-Amino-2-oxopyrimidin-1-yl)-3-hydroxyoxolan-2-yl]methoxymethoxy]-3,4,5-trihydroxyoxan-2-yl]methyl [3-hydroxy-5-(5-methyl-2,4-dioxopyrimidin-1-yl)oxolan-2-yl]methyl hydrogen phosphate
—— 6-[2-(1-Hydroxybutyl)-4-methylphenyl]hex-5-enoic acid 41449-51-8 C17H24O3
6-[2-(1-Hydroxybutyl)-4-methylphenyl]hex-5-enoic acid
—— [6-[3,4-Dihydroxy-2,5-bis(hydroxymethyl)oxolan-2-yl]oxy-2-(hydroxymethyl)-4,5-bis(6-methylheptanoyloxy)oxan-3-yl] 6-methylheptanoate —— C36H64O14
[6-[3,4-Dihydroxy-2,5-bis(hydroxymethyl)oxolan-2-yl]oxy-2-(hydroxymethyl)-4,5-bis(6-methylheptanoyloxy)oxan-3-yl] 6-methylheptanoate
—— 6,8-dihydroxy-7-(1-hydroxy-4-methyl-7-phenylheptyl)-3,9-dimethyl-8-[2-(5-oxo-2H-furan-3-yl)ethyl]-3-(18-phenyl-29-nonacyclo[19.10.1.11,28.121,24.02,20.03,12.04,9.05,31.013,18]tetratriaconta-3(12),4(9),5,7,10-pentaen-26-ynyl)-15-oxatricyclo[7.6.1.02,7]hexadec-10-yn-14-one —— C77H90O7
6,8-dihydroxy-7-(1-hydroxy-4-methyl-7-phenylheptyl)-3,9-dimethyl-8-[2-(5-oxo-2H-furan-3-yl)ethyl]-3-(18-phenyl-29-nonacyclo[19.10.1.11,28.121,24.02,20.03,12.04,9.05,31.013,18]tetratriaconta-3(12),4(9),5,7,10-pentaen-26-ynyl)-15-oxatricyclo[7.6.1.02,7]hexadec-10-yn-14-one
—— 6-[(2-Chlorophenyl)methoxy]-7-methyl-2-[(1-methylindol-3-yl)methylidene]-1-benzofuran-3-one —— C26H20ClNO3
6-[(2-Chlorophenyl)methoxy]-7-methyl-2-[(1-methylindol-3-yl)methylidene]-1-benzofuran-3-one
—— 6-Hexanoyl-2,2,4,4-tetramethylcyclohexane-1,3,5-trione —— C16H24O4
6-Hexanoyl-2,2,4,4-tetramethylcyclohexane-1,3,5-trione
—— [6-[2-[4-[11-Acetyloxy-9-(2-methylbutanoyl)-4-oxo-1,5,9-triazacyclotridec-2-yl]phenoxy]-4,5-dihydroxy-6-methyloxan-3-yl]oxy-3,4,5-trihydroxyoxan-2-yl]methyl propanoate —— C38H59N3O15
[6-[2-[4-[11-Acetyloxy-9-(2-methylbutanoyl)-4-oxo-1,5,9-triazacyclotridec-2-yl]phenoxy]-4,5-dihydroxy-6-methyloxan-3-yl]oxy-3,4,5-trihydroxyoxan-2-yl]methyl propanoate
—— 6-Acetyl-5-hydroxy-7-methyl-4-[3,4,5-trihydroxy-5-[3-[3-(2-hydroxyethyl)oxan-4-yl]butyl]-6-(hydroxymethyl)oxan-2-yl]oxynaphthalene-2-carboxylic acid —— C31H42O12
6-Acetyl-5-hydroxy-7-methyl-4-[3,4,5-trihydroxy-5-[3-[3-(2-hydroxyethyl)oxan-4-yl]butyl]-6-(hydroxymethyl)oxan-2-yl]oxynaphthalene-2-carboxylic acid
—— (6,9a-Dimethyl-3-methylidene-2,9-dioxo-3a,4,5,6,6a,9b-hexahydroazuleno[4,5-b]furan-4-yl) 2-methyloxirane-2-carboxylate —— C19H22O6
(6,9a-Dimethyl-3-methylidene-2,9-dioxo-3a,4,5,6,6a,9b-hexahydroazuleno[4,5-b]furan-4-yl) 2-methyloxirane-2-carboxylate
—— 6-(4,6-Dimethylocta-4,6-dien-2-yl)-7,8,14,16-tetrahydroxy-17-(hydroxymethyl)-3-methyl-5-oxa-19-thia-21-azabicyclo[16.2.1]henicosa-1(20),2,10,12,18(21)-pentaen-4-one —— C30H43NO7S
6-(4,6-Dimethylocta-4,6-dien-2-yl)-7,8,14,16-tetrahydroxy-17-(hydroxymethyl)-3-methyl-5-oxa-19-thia-21-azabicyclo[16.2.1]henicosa-1(20),2,10,12,18(21)-pentaen-4-one
—— 6-[6-oxo-6-(6-oxo-7,11-diazatricyclo[7.3.1.02,7]trideca-2,4-dien-11-yl)hexyl]-6aH-isoindolo[2,3-a]quinazoline-5,11-dione —— C32H32N4O4
6-[6-oxo-6-(6-oxo-7,11-diazatricyclo[7.3.1.02,7]trideca-2,4-dien-11-yl)hexyl]-6aH-isoindolo[2,3-a]quinazoline-5,11-dione
—— 6,36-Diamino-23-hydroxy-13,19,29-trimethyl-4-propan-2-yl-14,18,27,30-tetraoxa-9,10-dithia-5,37-diazaheptacyclo[32.3.1.02,7.013,26.015,24.017,22.029,31]octatriaconta-2,6,15(24),16,19,22,34(38),35-octaene-21,28-dione —— C36H44N4O7S2
6,36-Diamino-23-hydroxy-13,19,29-trimethyl-4-propan-2-yl-14,18,27,30-tetraoxa-9,10-dithia-5,37-diazaheptacyclo[32.3.1.02,7.013,26.015,24.017,22.029,31]octatriaconta-2,6,15(24),16,19,22,34(38),35-octaene-21,28-dione
—— 6-Acetyl-7,9-dihydroxy-2-[1-(2-hydroxy-5-propan-2-ylanilino)ethylidene]-8,9b-dimethyldibenzofuran-1,3-dione —— C27H27NO7
6-Acetyl-7,9-dihydroxy-2-[1-(2-hydroxy-5-propan-2-ylanilino)ethylidene]-8,9b-dimethyldibenzofuran-1,3-dione
—— 6,12,15-Trihydroxy-9,9,18-trimethyl-17-[1-(4-methyl-5-oxofuran-2-ylidene)propan-2-yl]-4,8,21-trioxahexacyclo[13.5.1.01,13.03,7.03,10.016,18]henicosane-5,14-dione —— C29H36O10
6,12,15-Trihydroxy-9,9,18-trimethyl-17-[1-(4-methyl-5-oxofuran-2-ylidene)propan-2-yl]-4,8,21-trioxahexacyclo[13.5.1.01,13.03,7.03,10.016,18]henicosane-5,14-dione
—— (6-ethenyl-6-methyl-3-methylidene-2-oxo-7-prop-1-en-2-yl-4,5,7,7a-tetrahydro-3aH-1-benzofuran-4-yl) 4-hydroxy-2-methylbut-2-enoate —— C20H26O5
(6-ethenyl-6-methyl-3-methylidene-2-oxo-7-prop-1-en-2-yl-4,5,7,7a-tetrahydro-3aH-1-benzofuran-4-yl) 4-hydroxy-2-methylbut-2-enoate
—— [6-Hydroxy-6-(2-hydroxy-3a,6,6,9b,11a-pentamethyl-7,10-dioxo-1,2,3,3b,4,11-hexahydroindeno[4,5-h]isochromen-1-yl)-2-methyl-5-oxohept-3-en-2-yl] acetate —— C31H42O8
[6-Hydroxy-6-(2-hydroxy-3a,6,6,9b,11a-pentamethyl-7,10-dioxo-1,2,3,3b,4,11-hexahydroindeno[4,5-h]isochromen-1-yl)-2-methyl-5-oxohept-3-en-2-yl] acetate
—— 6-Hydroxy-3-[2-(6-hydroxy-2-methylchromen-2-yl)ethyl]-2,4-dimethylbenzaldehyde —— C21H22O4
6-Hydroxy-3-[2-(6-hydroxy-2-methylchromen-2-yl)ethyl]-2,4-dimethylbenzaldehyde
—— 6-(2-Methylpropyl)-2-(2-phenylethyl)-3,6,17-triazatetracyclo[8.7.0.03,8.011,16]heptadeca-1(10),11,13,15-tetraene-4,7-dione —— C26H29N3O2
6-(2-Methylpropyl)-2-(2-phenylethyl)-3,6,17-triazatetracyclo[8.7.0.03,8.011,16]heptadeca-1(10),11,13,15-tetraene-4,7-dione
—— 6-(3,7-Dimethylocta-2,6-dienyl)-5,7-dihydroxy-3-(4-hydroxyphenyl)chromen-4-one —— C25H26O5
6-(3,7-Dimethylocta-2,6-dienyl)-5,7-dihydroxy-3-(4-hydroxyphenyl)chromen-4-one
—— 6-Bromo-7-chloro-1,3,4,7-tetramethyl-5,6,8,9-tetrahydrobenzo[7]annulene —— C15H20BrCl
6-Bromo-7-chloro-1,3,4,7-tetramethyl-5,6,8,9-tetrahydrobenzo[7]annulene
—— (6-Hydroxy-9-methoxy-3,5-dimethyl-5,6-dihydrobenzo[f][1]benzofuran-4-yl)methyl 2-methylbut-2-enoate —— C21H24O5
(6-Hydroxy-9-methoxy-3,5-dimethyl-5,6-dihydrobenzo[f][1]benzofuran-4-yl)methyl 2-methylbut-2-enoate
—— 6,7-dimethoxy-N-[3-methyl-1-(naphthalen-1-ylamino)-1-oxobutan-2-yl]-3,4-dihydroisoquinoline-2(1H)-carboxamide —— C27H31N3O4
6,7-dimethoxy-N-[3-methyl-1-(naphthalen-1-ylamino)-1-oxobutan-2-yl]-3,4-dihydroisoquinoline-2(1H)-carboxamide
—— 6-Fluoro-11,17-dihydroxy-16-methyl-3,20-dioxopregna-1,4-dien-21-yl acetate —— C24H31FO6
6-Fluoro-11,17-dihydroxy-16-methyl-3,20-dioxopregna-1,4-dien-21-yl acetate
—— 6-amino-2-[[2-[[13-[3-(diaminomethylideneamino)propyl]-22-(2-methylpropyl)-12,15,18,21,24-pentaoxo-25-[(5-oxopyrrolidine-2-carbonyl)amino]-19,26-di(propan-2-yl)-3,5,7,11,14,17,20,23-octazapentacyclo[14.13.2.12,27.15,8.04,30]tritriaconta-1,4(30),6,8(33),27(32),28-hexaene-10-carbonyl]amino]-3-(1H-imidazol-5-yl)propanoyl]amino]hexanoic acid —— C57H82N18O11
6-amino-2-[[2-[[13-[3-(diaminomethylideneamino)propyl]-22-(2-methylpropyl)-12,15,18,21,24-pentaoxo-25-[(5-oxopyrrolidine-2-carbonyl)amino]-19,26-di(propan-2-yl)-3,5,7,11,14,17,20,23-octazapentacyclo[14.13.2.12,27.15,8.04,30]tritriaconta-1,4(30),6,8(33),27(32),28-hexaene-10-carbonyl]amino]-3-(1H-imidazol-5-yl)propanoyl]amino]hexanoic acid
—— (6-Oxo-2,3,7,7a-tetrahydro-1-benzofuran-3a-yl) hexanoate —— C14H20O4
(6-Oxo-2,3,7,7a-tetrahydro-1-benzofuran-3a-yl) hexanoate
—— 6-[[2-[(4-Ethyl-2-keto-8,8-dimethyl-9,10-dihydropyrano[2,3-h]chromen-5-yl)oxy]acetyl]amino]hexanoic acid —— C24H31NO7
6-[[2-[(4-Ethyl-2-keto-8,8-dimethyl-9,10-dihydropyrano[2,3-h]chromen-5-yl)oxy]acetyl]amino]hexanoic acid
—— 6-acetyl-5-hydroxy-10-(3-hydroxy-4-methoxyphenyl)-4-methyl-9,10-dihydropyrano[2,3-f]chromene-2,8-dione —— C22H18O8
6-acetyl-5-hydroxy-10-(3-hydroxy-4-methoxyphenyl)-4-methyl-9,10-dihydropyrano[2,3-f]chromene-2,8-dione
—— 6-bromo-2,2'-dioxo-2H,2'H-[3,4'-bichromen]-7'-yl dimethylcarbamate —— C21H14BrNO6
6-bromo-2,2'-dioxo-2H,2'H-[3,4'-bichromen]-7'-yl dimethylcarbamate
—— 6-[[8,9-Dihydroxy-4-(hydroxymethyl)-4,6a,6b,11,11,14b-hexamethyl-10-(2-methylbut-2-enoyloxy)-8a-(2-methylbut-2-enoyloxymethyl)-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicen-3-yl]oxy]-3,4,5-trihydroxyoxane-2-carboxylic acid —— C46H70O14
6-[[8,9-Dihydroxy-4-(hydroxymethyl)-4,6a,6b,11,11,14b-hexamethyl-10-(2-methylbut-2-enoyloxy)-8a-(2-methylbut-2-enoyloxymethyl)-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicen-3-yl]oxy]-3,4,5-trihydroxyoxane-2-carboxylic acid
—— 6-hydroxy-7-methoxy-2-(4-methoxybenzyl)-1,2,3,4-tetrahydroisoquinoline —— C18H21NO3
6-hydroxy-7-methoxy-2-(4-methoxybenzyl)-1,2,3,4-tetrahydroisoquinoline
—— [6-[3,4-Dihydroxy-5-(2-pyridin-3-ylethoxy)phenyl]-23-hydroxy-5,21-dioxa-13,14-dithiapentacyclo[20.3.1.116,20.03,12.04,9]heptacosa-1(26),10,22,24-tetraen-8-yl] acetate —— C38H43NO8S2
[6-[3,4-Dihydroxy-5-(2-pyridin-3-ylethoxy)phenyl]-23-hydroxy-5,21-dioxa-13,14-dithiapentacyclo[20.3.1.116,20.03,12.04,9]heptacosa-1(26),10,22,24-tetraen-8-yl] acetate
—— [6-[[3-(Diaminomethyl)phenyl]methyl]-5-hydroxy-4-(hydroxymethyl)-1-naphthalen-2-yl-9,10-dioxo-7-(3,4,4,5-tetrahydroxy-6-methyloxan-2-yl)oxyanthracen-2-yl] acetate —— C41H38N2O12
[6-[[3-(Diaminomethyl)phenyl]methyl]-5-hydroxy-4-(hydroxymethyl)-1-naphthalen-2-yl-9,10-dioxo-7-(3,4,4,5-tetrahydroxy-6-methyloxan-2-yl)oxyanthracen-2-yl] acetate
—— 6-hydroxy-3-(prop-2-en-1-yl)-5-{1H,2H,3H,4H,9H-pyrido[3,4-b]indol-1-yl}-2-sulfanylidene-1,2,3,4-tetrahydropyrimidin-4-one —— C18H18N4O2S
6-hydroxy-3-(prop-2-en-1-yl)-5-{1H,2H,3H,4H,9H-pyrido[3,4-b]indol-1-yl}-2-sulfanylidene-1,2,3,4-tetrahydropyrimidin-4-one