(1R,3S,4R,5R)-3-[(E/Z)-1-benzyloxymethyl-2-ethoxycarbonylethenyl]-4-methyl-7,7-dimethyl-2,6,8-trioxabicyclo[3.3.0]octane

ethyl 3-(4-ethylphenyl)prop-2-enoate

Ethyl 3-oxo-2(4-chlorophenyl)isoindoline-1-acetate

2-(2-oxo-1,2-dihydro-3H-indol-3(E)-ylidene)acetic acid ethyl ester