2-[2-(2-amino-2-carboxyethyl)sulfanylethyl]-1,3-thiazolidine-4-carboxylic acid

cysteine S-ethyliminobis(methylenephosphonic acid)

[[(2-羟基乙基)亚氨基]二(亚甲基)]二膦酸

S-烯丙基-L-半胱氨酸盐酸盐

S-2-硝基苯基-L-半胱氨酸