(3S,6S,9S,12S)-methyl 3-((1H-imidazol-5-yl)methyl)-6-((1H-indol-3-yl)methyl)-12-(4-hydroxybenzyl)-9-(hydroxymethyl)-1,4,7,10-tetraoxo-1-((S)-5-oxopyrrolidin-2-yl)-2,5,8,11-tetraazatridecan-13-oate,(3S,6S,9S,12S)-methyl 3-((1H-imidazol-5-yl)methyl)-6-((1H-indol-3-yl)methyl)-12-(4-hydroxybenzyl)-9-(hydroxymethyl)-1,4,7,10-tetraoxo-1-((S)-5-oxopyrrolidin-2-yl)-2,5,8,11-tetraazatridecan-13-oate,Leuprolide Impurity