Synonyms: Pyrrolidinium,2-carboxy-1,1-dimethyl-, hydroxide, inner salt, (S)-;Stachydrine (6CI,8CI);(-)-Stachydrine;(S)-2-Carboxy-1,1-dimethylpyrrolidinium hydroxide inner salt;1-Methylproline methylbetaine;Cadabine;Hygric acid, methylbetaine;L-Stachydrine;Methyl hygrate betaine;Proline betaine;S-(-)-Stachydrine;Stachydrin;