(2E)-4-(4-羟基-3-甲氧基苯基)-4-氧代-2-丁烯酸

2-ethoxy-3-methyl-2H-furan-5-one

{[(苄氧基)羰基]氨基}(羟基)乙酸

2,2-bis(((benzyloxy)carbonyl)amino)acetic acid

2-(tert-butylamino)-2-diphenylphosphanylacetic acid