Liraglutide Impurity 64

(S) -4-[ (S) -2-[ (S) -2-[ (S) -2-[ (S) -2-[ (S) -2-[ (S) -2-[ (S) -2-[ (2S,3R) -2-[ (S) -2-[ (2S,3R) -2- ({[ (S) -2-[ (S) -2-[ (S) -2-Amino-3- (4-imidazolyl) propionylamino]propionylamino]-4-carboxybutyrylamino]methyl}carbonylamino) -3-hydroxybutyrylamino]-3-phenylpropionylamino]-3-hydroxybutyrylamino]-3-hydroxypropionylamino]-3-carboxypropionylamino]-3-methylbutyrylamino]-3-hydroxypropionylamino]-3-hydroxypropionylamino]-3- (p-hydroxyphenyl) propionylamino]-4-methylvalerylamino]-4- ({[N- (S) -1,3-bis[N- (S) -1-[N- (S) -1-[N- (S) -5-[ (S) -4-tert-butoxycarbonyl-4-palmitoylaminobutyrylamino]-1-[N- (S) -3-carboxy-1-[N- (S) -1-[N- (1S,2S) -2-methyl-1-[N- (S) -1-[N- (S) -2- (3-indolyl) -1-[N- (S) -3-methyl-1-[N- (S) -2-methyl-1-[N- (S) -4-guanidino-1- ({[N- (S) -1-[ (carboxymethyl) carbamoyl]-4-guanidinobutylcarbamoyl]methyl}carbamoyl) butylcarbamoyl]propylcarbamoyl]butylcarbamoyl]ethylcarbamoyl]ethylcarbamoyl]butylcarbamoyl]-2-phenylethylcarbamoyl]propylcarbamoyl]pentylcarbamoyl]ethylcarbamoyl]ethylcarbamoyl]propylcarbamoyl]methyl}carbamoyl) butyric acid