A class of chemical compounds containing a four-membered ring with a double bond and a ketone group.
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2(5H)-Furanone, 5-ethyl-4-methyl-3-phenyl-
2(5H)-Furanone, 3-(4-chlorophenyl)-
2-[1-(4-methoxyphenyl)-1H-tetrazol-5-yl]acetic acid
4-hydroxy-3-(4-prenyloxyphenyl)furan-2(5H)-one
1'-methyl-3-phenyl-5H-spiro[furan-2,3'-indoline]-2',5-dione
