Gonadorelin acetate EP Impurity E

(S) -N- ((4S,7S,10S,13R) -13- ((1H-imidazol-5-yl) methyl) -10- ((1H-indol-3-yl) methyl) -4- (4-hydroxybenzyl) -7- (hydroxymethyl) -2,5,8,11,14,15-hexaoxo-15- ((S) -5-oxopyrrolidin-2-yl) -3,6,9,12-tetraazapentadecyl) -2- ((S) -5-guanidino-2- (((S) -2- (3-hydrazineyl-2-oxopropanoyl) pyrrolidin-1-yl) amino) pentanamido) -4-methylpentanamide