(E)-diethyl 2-(3,4-dimethoxyphenyl)pent-2-enedioate
(Z)-diethyl 2-(3,4-dimethoxyphenyl)pent-2-enedioate
diethyl 1H-pyrazole-3,5-dicarboxylate
ethyl 4-hydroxy-1-(phenylsulfonyl)cyclohepta-1,3,5-triene-3-carboxylate
2-(ethoxycarbonyl)-4-(phenylsulfonyl)cyclohepta-2,4,6-trien-1-one