Synonyms: H-Hyp-OMe·HCl;L-Proline,4-hydroxy-, methyl ester, hydrochloride, (4R)- (9CI);L-Proline, 4-hydroxy-, methylester, hydrochloride, trans-;Proline, 4-hydroxy-, methyl ester, hydrochloride(7CI);(2S,4R)-4-Hydroxy-pyrrolidine-2-carboxylic acid methyl esterhydrochloride;(2S,4R)-Methyl 4-hydroxypyrrolidine-2-carboxylate hydrochloride;(4R)-4-Hydroxy-L-proline methyl ester hydrochloride;4-Hydroxy-L-proline methylester hydrochloride;4-Hydroxyproline methyl ester hydrochloride;4-trans-Hydroxy-L-proline methyl ester hydrochloride;Hydroxyproline methylester hydrochloride;L-Hydroxyproline methyl ester hydrochloride;Methyl(2S,4R)-4-hydroxy-2-pyrrolidinecarboxylate hydrochloride;MethylL-hydroxyprolinate hydrochloride;Methyl trans-4-hydroxy-L-prolinatehydrochloride;