Carbetocin Impurity 33

(3S,9S,12S,15S,18S) -18- (2-amino-2-oxoethyl) -1- ((2S) -1- ((6S,9S,12S,15S) -6- (2-amino-2-oxoethyl) -9- (3-amino-3-oxopropyl) -12- ((S) -sec-butyl) -15- (4-hydroxybenzyl) -16-methyl-5,8,11,14,17-pentaoxo-1-thia-4,7,10,13,16-pentaazacycloicosane-3-carbonyl) pyrrolidin-2-yl) -21- ((S) -2- (((S) -1- ((2-amino-2-oxoethyl) amino) -4-methyl-1-oxopentan-2-yl) carbamoyl) pyrrolidine-1-carbonyl) -15- (3-amino-3-oxopropyl) -12- ((S) -sec-butyl) -9- (4-hydroxybenzyl) -3-isobutyl-8-methyl-1,4,7,10,13,16,19-heptaoxo-23-thia-2,5,8,11,14,17,20-heptaazaheptacosan-27-oic acid