(S)-2-[((E)-But-2-enoyl)-(4-methoxy-benzyl)-amino]-pentanedioic acid 5-tert-butyl ester 1-methyl ester

N-(2-methoxyphenyl)-N-(3-oxobutyl)-(E)-but-2-enamide

1-ethyl-2-[(E)-2-butenoyl]-5-spirocyclohexane-pyrazolidin-3-one

1,2-dideoxy-1,2-[(E)-N-(2-butenoyl)epoxycarbonylimino]-3,4-di-O-pivaloyl-β-D-arabinopyranose

(E)-1-((1S,5R,7R)-10,10-Dimethyl-3-thioxo-4-oxa-2-aza-tricyclo[5.2.1.01,5]dec-2-yl)-but-2-en-1-one