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苯并间二氧杂环戊烯类

中文名称 英文名称 CAS号 化学式 结构式图片
—— (6S)-3-(1,3-benzodioxol-5-ylmethyl)-2-(4-chlorophenyl)imino-N-(4-methoxyphenyl)-4-oxo-1,3-thiazinane-6-carboxamide —— C26H22ClN3O5S
(6S)-3-(1,3-benzodioxol-5-ylmethyl)-2-(4-chlorophenyl)imino-N-(4-methoxyphenyl)-4-oxo-1,3-thiazinane-6-carboxamide
—— (6S)-3-(1,3-benzodioxol-5-ylmethyl)-N-(3-ethoxyphenyl)-2-(4-methoxyphenyl)imino-4-oxo-1,3-thiazinane-6-carboxamide —— C28H27N3O6S
(6S)-3-(1,3-benzodioxol-5-ylmethyl)-N-(3-ethoxyphenyl)-2-(4-methoxyphenyl)imino-4-oxo-1,3-thiazinane-6-carboxamide
—— (6R)-3-(1,3-benzodioxol-5-ylmethyl)-2-(4-ethoxyphenyl)imino-N-(2-methoxyphenyl)-4-oxo-1,3-thiazinane-6-carboxamide —— C28H27N3O6S
(6R)-3-(1,3-benzodioxol-5-ylmethyl)-2-(4-ethoxyphenyl)imino-N-(2-methoxyphenyl)-4-oxo-1,3-thiazinane-6-carboxamide
—— (6R)-2-[2-(1,3-benzodioxol-5-yl)ethylimino]-3-(4-fluorophenyl)-4-oxo-N-(4-propoxyphenyl)-1,3-thiazinane-6-carboxamide —— C29H28FN3O5S
(6R)-2-[2-(1,3-benzodioxol-5-yl)ethylimino]-3-(4-fluorophenyl)-4-oxo-N-(4-propoxyphenyl)-1,3-thiazinane-6-carboxamide
—— (6S)-3-(1,3-benzodioxol-5-ylmethyl)-N-(3-chlorophenyl)-2-(4-methoxyphenyl)imino-4-oxo-1,3-thiazinane-6-carboxamide —— C26H22ClN3O5S
(6S)-3-(1,3-benzodioxol-5-ylmethyl)-N-(3-chlorophenyl)-2-(4-methoxyphenyl)imino-4-oxo-1,3-thiazinane-6-carboxamide
—— (6R)-3-(1,3-benzodioxol-5-ylmethyl)-N-(4-ethoxyphenyl)-2-(4-methoxyphenyl)imino-4-oxo-1,3-thiazinane-6-carboxamide —— C28H27N3O6S
(6R)-3-(1,3-benzodioxol-5-ylmethyl)-N-(4-ethoxyphenyl)-2-(4-methoxyphenyl)imino-4-oxo-1,3-thiazinane-6-carboxamide
—— (6R)-3-(1,3-benzodioxol-5-ylmethyl)-2-(4-chlorophenyl)imino-N-(4-methoxyphenyl)-4-oxo-1,3-thiazinane-6-carboxamide —— C26H22ClN3O5S
(6R)-3-(1,3-benzodioxol-5-ylmethyl)-2-(4-chlorophenyl)imino-N-(4-methoxyphenyl)-4-oxo-1,3-thiazinane-6-carboxamide
—— (6R)-3-(1,3-benzodioxol-5-ylmethyl)-N-(4-chlorophenyl)-2-(4-fluorophenyl)imino-4-oxo-1,3-thiazinane-6-carboxamide —— C25H19ClFN3O4S
(6R)-3-(1,3-benzodioxol-5-ylmethyl)-N-(4-chlorophenyl)-2-(4-fluorophenyl)imino-4-oxo-1,3-thiazinane-6-carboxamide
—— (6S)-2-[2-(1,3-benzodioxol-5-yl)ethylimino]-3-(4-fluorophenyl)-4-oxo-N-(4-propoxyphenyl)-1,3-thiazinane-6-carboxamide —— C29H28FN3O5S
(6S)-2-[2-(1,3-benzodioxol-5-yl)ethylimino]-3-(4-fluorophenyl)-4-oxo-N-(4-propoxyphenyl)-1,3-thiazinane-6-carboxamide
—— (6S)-3-(1,3-benzodioxol-5-ylmethyl)-N-(4-ethoxyphenyl)-2-(4-methoxyphenyl)imino-4-oxo-1,3-thiazinane-6-carboxamide —— C28H27N3O6S
(6S)-3-(1,3-benzodioxol-5-ylmethyl)-N-(4-ethoxyphenyl)-2-(4-methoxyphenyl)imino-4-oxo-1,3-thiazinane-6-carboxamide
—— (6S)-3-(1,3-benzodioxol-5-ylmethyl)-2-(4-ethoxyphenyl)imino-N-(2-methoxyphenyl)-4-oxo-1,3-thiazinane-6-carboxamide —— C28H27N3O6S
(6S)-3-(1,3-benzodioxol-5-ylmethyl)-2-(4-ethoxyphenyl)imino-N-(2-methoxyphenyl)-4-oxo-1,3-thiazinane-6-carboxamide
—— (6R)-3-(1,3-benzodioxol-5-ylmethyl)-N-(3-ethoxyphenyl)-2-(4-methoxyphenyl)imino-4-oxo-1,3-thiazinane-6-carboxamide —— C28H27N3O6S
(6R)-3-(1,3-benzodioxol-5-ylmethyl)-N-(3-ethoxyphenyl)-2-(4-methoxyphenyl)imino-4-oxo-1,3-thiazinane-6-carboxamide
—— (6S)-3-(1,3-benzodioxol-5-ylmethyl)-N-(3-chloro-4-methylphenyl)-2-(4-methoxyphenyl)imino-4-oxo-1,3-thiazinane-6-carboxamide —— C27H24ClN3O5S
(6S)-3-(1,3-benzodioxol-5-ylmethyl)-N-(3-chloro-4-methylphenyl)-2-(4-methoxyphenyl)imino-4-oxo-1,3-thiazinane-6-carboxamide
—— (6R)-3-(1,3-benzodioxol-5-ylmethyl)-2-(4-fluorophenyl)imino-N-(4-methoxyphenyl)-4-oxo-1,3-thiazinane-6-carboxamide —— C26H22FN3O5S
(6R)-3-(1,3-benzodioxol-5-ylmethyl)-2-(4-fluorophenyl)imino-N-(4-methoxyphenyl)-4-oxo-1,3-thiazinane-6-carboxamide
—— (6R)-3-(1,3-benzodioxol-5-ylmethyl)-N-(3-chlorophenyl)-2-(4-methoxyphenyl)imino-4-oxo-1,3-thiazinane-6-carboxamide —— C26H22ClN3O5S
(6R)-3-(1,3-benzodioxol-5-ylmethyl)-N-(3-chlorophenyl)-2-(4-methoxyphenyl)imino-4-oxo-1,3-thiazinane-6-carboxamide
—— (2H-1,3-Benzodioxol-5-yl)ethanimidamidium 310466-21-8 C9H11N2O2+
(2H-1,3-Benzodioxol-5-yl)ethanimidamidium
—— ethyl (2Z,5S)-5-(1,3-benzodioxol-5-yl)-2-[[3-[(4-chlorophenyl)methoxy]phenyl]methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C31H25ClN2O6S
ethyl (2Z,5S)-5-(1,3-benzodioxol-5-yl)-2-[[3-[(4-chlorophenyl)methoxy]phenyl]methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— ethyl (2Z,5R)-5-(1,3-benzodioxol-5-yl)-2-[[3-[(4-chlorophenyl)methoxy]phenyl]methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C31H25ClN2O6S
ethyl (2Z,5R)-5-(1,3-benzodioxol-5-yl)-2-[[3-[(4-chlorophenyl)methoxy]phenyl]methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— ethyl (2Z,5R)-5-(1,3-benzodioxol-5-yl)-2-[[4-[(2-chlorophenyl)methoxy]-3-methoxyphenyl]methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C32H27ClN2O7S
ethyl (2Z,5R)-5-(1,3-benzodioxol-5-yl)-2-[[4-[(2-chlorophenyl)methoxy]-3-methoxyphenyl]methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— ethyl (2Z,5S)-5-(1,3-benzodioxol-5-yl)-2-[(3-bromo-4-hydroxyphenyl)methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C24H19BrN2O6S
ethyl (2Z,5S)-5-(1,3-benzodioxol-5-yl)-2-[(3-bromo-4-hydroxyphenyl)methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— ethyl (2Z,5R)-5-(1,3-benzodioxol-5-yl)-2-[[2-[(2,4-dichlorophenyl)methoxy]phenyl]methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C31H24Cl2N2O6S
ethyl (2Z,5R)-5-(1,3-benzodioxol-5-yl)-2-[[2-[(2,4-dichlorophenyl)methoxy]phenyl]methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— ethyl (2Z,5S)-5-(1,3-benzodioxol-5-yl)-2-[(3,5-dichloro-2-hydroxyphenyl)methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C24H18Cl2N2O6S
ethyl (2Z,5S)-5-(1,3-benzodioxol-5-yl)-2-[(3,5-dichloro-2-hydroxyphenyl)methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— ethyl (2Z,5R)-5-(1,3-benzodioxol-5-yl)-2-[[2-[(4-chlorophenyl)methoxy]phenyl]methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C31H25ClN2O6S
ethyl (2Z,5R)-5-(1,3-benzodioxol-5-yl)-2-[[2-[(4-chlorophenyl)methoxy]phenyl]methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— ethyl (2Z,5R)-5-(1,3-benzodioxol-5-yl)-2-[(3,5-dichloro-2-hydroxyphenyl)methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C24H18Cl2N2O6S
ethyl (2Z,5R)-5-(1,3-benzodioxol-5-yl)-2-[(3,5-dichloro-2-hydroxyphenyl)methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— ethyl (2Z,5S)-5-(1,3-benzodioxol-5-yl)-2-[[4-[(4-chlorophenyl)methoxy]-3-methoxyphenyl]methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C32H27ClN2O7S
ethyl (2Z,5S)-5-(1,3-benzodioxol-5-yl)-2-[[4-[(4-chlorophenyl)methoxy]-3-methoxyphenyl]methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— ethyl (2Z,5S)-5-(1,3-benzodioxol-5-yl)-2-[[4-[(2-chlorophenyl)methoxy]-3-methoxyphenyl]methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C32H27ClN2O7S
ethyl (2Z,5S)-5-(1,3-benzodioxol-5-yl)-2-[[4-[(2-chlorophenyl)methoxy]-3-methoxyphenyl]methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— ethyl (2Z,5S)-5-(1,3-benzodioxol-5-yl)-2-[[3-[(2-chlorophenyl)methoxy]phenyl]methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C31H25ClN2O6S
ethyl (2Z,5S)-5-(1,3-benzodioxol-5-yl)-2-[[3-[(2-chlorophenyl)methoxy]phenyl]methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— ethyl (2Z,5R)-5-(1,3-benzodioxol-5-yl)-2-[(3-bromo-4-hydroxyphenyl)methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C24H19BrN2O6S
ethyl (2Z,5R)-5-(1,3-benzodioxol-5-yl)-2-[(3-bromo-4-hydroxyphenyl)methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— ethyl (2Z,5R)-5-(1,3-benzodioxol-5-yl)-2-[[3-[(2,4-dichlorophenyl)methoxy]phenyl]methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C31H24Cl2N2O6S
ethyl (2Z,5R)-5-(1,3-benzodioxol-5-yl)-2-[[3-[(2,4-dichlorophenyl)methoxy]phenyl]methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— ethyl (2Z,5R)-5-(1,3-benzodioxol-5-yl)-2-[[2-[(2-chlorophenyl)methoxy]phenyl]methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C31H25ClN2O6S
ethyl (2Z,5R)-5-(1,3-benzodioxol-5-yl)-2-[[2-[(2-chlorophenyl)methoxy]phenyl]methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— ethyl (2Z,5R)-5-(1,3-benzodioxol-5-yl)-2-[[3-[(2-chlorophenyl)methoxy]phenyl]methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C31H25ClN2O6S
ethyl (2Z,5R)-5-(1,3-benzodioxol-5-yl)-2-[[3-[(2-chlorophenyl)methoxy]phenyl]methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— ethyl (2Z,5S)-5-(1,3-benzodioxol-5-yl)-2-[[2-[(4-chlorophenyl)methoxy]phenyl]methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C31H25ClN2O6S
ethyl (2Z,5S)-5-(1,3-benzodioxol-5-yl)-2-[[2-[(4-chlorophenyl)methoxy]phenyl]methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— ethyl (2Z,5S)-5-(1,3-benzodioxol-5-yl)-2-[[2-[(2-chlorophenyl)methoxy]phenyl]methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C31H25ClN2O6S
ethyl (2Z,5S)-5-(1,3-benzodioxol-5-yl)-2-[[2-[(2-chlorophenyl)methoxy]phenyl]methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— ethyl (2Z,5S)-5-(1,3-benzodioxol-5-yl)-2-[[3-[(2,4-dichlorophenyl)methoxy]phenyl]methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C31H24Cl2N2O6S
ethyl (2Z,5S)-5-(1,3-benzodioxol-5-yl)-2-[[3-[(2,4-dichlorophenyl)methoxy]phenyl]methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— ethyl (2Z,5S)-5-(1,3-benzodioxol-5-yl)-2-[[2-[(2,4-dichlorophenyl)methoxy]phenyl]methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C31H24Cl2N2O6S
ethyl (2Z,5S)-5-(1,3-benzodioxol-5-yl)-2-[[2-[(2,4-dichlorophenyl)methoxy]phenyl]methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— 2-[(5R,7R)-3-[4-(1,3-benzodioxol-5-ylmethylamino)-5-chloro-6-oxopyridazin-1-yl]-1-adamantyl]acetic acid —— C24H26ClN3O5
2-[(5R,7R)-3-[4-(1,3-benzodioxol-5-ylmethylamino)-5-chloro-6-oxopyridazin-1-yl]-1-adamantyl]acetic acid
—— 2-[(5S,7S)-3-[4-(1,3-benzodioxol-5-ylmethylamino)-5-chloro-6-oxopyridazin-1-yl]-1-adamantyl]acetic acid —— C24H26ClN3O5
2-[(5S,7S)-3-[4-(1,3-benzodioxol-5-ylmethylamino)-5-chloro-6-oxopyridazin-1-yl]-1-adamantyl]acetic acid
—— 6-(azepan-1-yl)-2-N-[(E)-(6-nitro-1,3-benzodioxol-5-yl)methylideneamino]-4-N-(4-nitrophenyl)-1,3,5-triazine-2,4-diamine —— C23H23N9O6
6-(azepan-1-yl)-2-N-[(E)-(6-nitro-1,3-benzodioxol-5-yl)methylideneamino]-4-N-(4-nitrophenyl)-1,3,5-triazine-2,4-diamine
—— (1R,6S,7S)-N-[(E)-(6-bromo-1,3-benzodioxol-5-yl)methylideneamino]-1-methylbicyclo[4.1.0]heptane-7-carboxamide —— C17H19BrN2O3
(1R,6S,7S)-N-[(E)-(6-bromo-1,3-benzodioxol-5-yl)methylideneamino]-1-methylbicyclo[4.1.0]heptane-7-carboxamide
—— 6-(azepan-1-yl)-5-[(Z)-[3-(1,3-benzodioxol-5-ylmethyl)-4-oxo-2-sulfanylidene-1,3-thiazolidin-5-ylidene]methyl]-1-butyl-4-methyl-2-oxopyridine-3-carbonitrile —— C29H32N4O4S2
6-(azepan-1-yl)-5-[(Z)-[3-(1,3-benzodioxol-5-ylmethyl)-4-oxo-2-sulfanylidene-1,3-thiazolidin-5-ylidene]methyl]-1-butyl-4-methyl-2-oxopyridine-3-carbonitrile
—— ethyl 1-[3-[(Z)-[3-(1,3-benzodioxol-5-ylmethyl)-4-oxo-2-sulfanylidene-1,3-thiazolidin-5-ylidene]methyl]-5-cyano-1-ethyl-4-methyl-6-oxopyridin-2-yl]piperidine-3-carboxylate —— C29H30N4O6S2
ethyl 1-[3-[(Z)-[3-(1,3-benzodioxol-5-ylmethyl)-4-oxo-2-sulfanylidene-1,3-thiazolidin-5-ylidene]methyl]-5-cyano-1-ethyl-4-methyl-6-oxopyridin-2-yl]piperidine-3-carboxylate
—— 5-[(Z)-[3-(1,3-benzodioxol-5-ylmethyl)-4-oxo-2-sulfanylidene-1,3-thiazolidin-5-ylidene]methyl]-1,4-dimethyl-6-morpholin-4-yl-2-oxopyridine-3-carbonitrile —— C24H22N4O5S2
5-[(Z)-[3-(1,3-benzodioxol-5-ylmethyl)-4-oxo-2-sulfanylidene-1,3-thiazolidin-5-ylidene]methyl]-1,4-dimethyl-6-morpholin-4-yl-2-oxopyridine-3-carbonitrile
—— 5-[(Z)-[3-(1,3-benzodioxol-5-ylmethyl)-4-oxo-2-sulfanylidene-1,3-thiazolidin-5-ylidene]methyl]-1,4-dimethyl-6-(3-methylpiperidin-1-yl)-2-oxopyridine-3-carbonitrile —— C26H26N4O4S2
5-[(Z)-[3-(1,3-benzodioxol-5-ylmethyl)-4-oxo-2-sulfanylidene-1,3-thiazolidin-5-ylidene]methyl]-1,4-dimethyl-6-(3-methylpiperidin-1-yl)-2-oxopyridine-3-carbonitrile
—— N-[(Z)-1-(2-fluorophenyl)ethylideneamino]-1,3-benzodioxole-5-carboxamide —— C16H13FN2O3
N-[(Z)-1-(2-fluorophenyl)ethylideneamino]-1,3-benzodioxole-5-carboxamide
—— ethyl N-[(Z)-(6-bromo-1,3-benzodioxol-5-yl)methylideneamino]carbamate —— C11H11BrN2O4
ethyl N-[(Z)-(6-bromo-1,3-benzodioxol-5-yl)methylideneamino]carbamate
—— [(1R,4S,5S,8R,9S)-4-(1,3-benzodioxol-5-yl)-6,8,9-trimethyl-3-oxabicyclo[3.3.1]non-6-en-1-yl]methanol —— C19H24O4
[(1R,4S,5S,8R,9S)-4-(1,3-benzodioxol-5-yl)-6,8,9-trimethyl-3-oxabicyclo[3.3.1]non-6-en-1-yl]methanol
—— [(1R,4S,5S,8S,9S)-4-(1,3-benzodioxol-5-yl)-6,8,9-trimethyl-3-oxabicyclo[3.3.1]non-6-en-1-yl]methanol —— C19H24O4
[(1R,4S,5S,8S,9S)-4-(1,3-benzodioxol-5-yl)-6,8,9-trimethyl-3-oxabicyclo[3.3.1]non-6-en-1-yl]methanol
—— (4E)-4-(1,3-benzodioxol-5-ylmethylidene)-3-(3-nitrophenyl)-1,2-oxazol-5-one —— C17H10N2O6
(4E)-4-(1,3-benzodioxol-5-ylmethylidene)-3-(3-nitrophenyl)-1,2-oxazol-5-one
—— N-[(Z)-1-(1,3-benzodioxol-5-yl)ethylideneamino]-1-ethyl-2-methylbenzimidazole-5-carboxamide —— C20H20N4O3
N-[(Z)-1-(1,3-benzodioxol-5-yl)ethylideneamino]-1-ethyl-2-methylbenzimidazole-5-carboxamide
—— (5E)-5-(1,3-benzodioxol-5-ylmethylidene)-3-[(3R)-1,1-dihydroxythiolan-3-yl]-2-sulfanylidene-1,3-thiazolidin-4-one —— C15H15NO5S3
(5E)-5-(1,3-benzodioxol-5-ylmethylidene)-3-[(3R)-1,1-dihydroxythiolan-3-yl]-2-sulfanylidene-1,3-thiazolidin-4-one