Refers to a carbon-carbon double bond.
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3-(4-chlorophenyl)-5,6-diphenyl-2H-pyran-2-one
(Z)-3-(4-toluenesulfonyloxymethylene)tetrahydro-2H-pyran-2-one
9-(bromo-phenyl-methylene)-1,8-dimethoxy-9H-thioxanthene
