Organic compounds that contain a five-membered ring with four carbon atoms and one oxygen atom.
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4-chloro-2-iodo-N-methoxy-N-methylbenzamide
(E)-2-(phenylthio)-3-methyl-4-oxo-6-methyl-2,3,4,5,6,7-hexahydrobenzofuran
4-(tert-Butyl-dimethyl-silanyloxymethyl)-3-methyl-cyclohex-2-enone
4(2H)-Benzofuranone, 3,5,6,7-tetrahydro-2,6,6-trimethyl-2-phenyl-
4-Pentenoic acid, 2-acetyl-3-methyl-5-(phenylsulfonyl)-, ethyl ester, (4E)-
