2-crotonyl-1-cyano-1,2-dihydroisoquinoline

(2S,4aS,7R,8aR)-N-crotonyl-2-(2-methylpropenyl)-4,4,7-trimethyloctahydrobenz[e][1,3]oxazine

but-2-enoic acid 1-[hydroxy(diphenyl)methyl]-7,7-dimethyl-bicyclo[2.2.1]hept-2-yl ester

1-[N-(E)-but-2-enoyl-N-(4-methoxyphenyl)aminomethyl]-2-oxocyclopentanecarboxylic acid ethyl ester

3-Crotonyl-4-trimethylsilylcyclooctene