Icatibant Impurity 19

((2S,3aS,7aS) -1- ((R) -2- (((S) -2- (2- ((2S,4R) -1- ((5-guanidino-2-oxopentanoyl) -L-arginyl-L-prolyl) -4-hydroxypyrrolidine-2-carboxamido) acetamido) -3- (thiophen-2-yl) propanoyl) -L-seryl) -1,2,3,4-tetrahydroisoquinoline-3-carbonyl) octahydro-1H-indole-2-carbonyl) -L-arginine