12-methoxy-3-methoxycarbonyl-12-oxododec-3-enoate

1-[2-(dimethylamino)ethyl]pyrrolidine-2,5-dione

4-(3,4-dimethoxyphenyl)-3-methoxycarbonylbut-3-enoate

dimethyl 2-benzhydrylidenebutanedioate

(Z)-4-(1,3-benzodioxol-5-yl)-3-methoxycarbonylbut-3-enoic acid