4-phenyl-but-1-ene-1,1,3,3-tetracarboxylic acid tetraethyl ester

3-bromoprop-2-ynoic acid

2,3-二溴-4-氧-2-丁烯酸

3-chloroprop-2-ynoic acid

(E)/(Z)-2,3-二溴丙酸