Triptorelin Impurity 15

(S) -N- ((6S,9S,12R,15S,18S,21S,24S) -12,21-bis ((1H-indol-3-yl) methyl) -1-amino-6- ((S) -2-carbamoylpyrrolidine-1-carbonyl) -15- (4-hydroxybenzyl) -18- (hydroxymethyl) -25- (1H-imidazol-5-yl) -1-imino-9-isobutyl-8,11,14,17,20,23-hexaoxo-2,7,10,13,16,19,22-heptaazapentacosan-24-yl) -5-oxopyrrolidine-2-carboxamide