Lanreotide Impurity 6

(4R,7S,10S,13R,16S,19R) -13- ((1H-indol-3-yl) methyl) -19- ((R) -2-amino-3- (naphthalen-2-yl) propanamido) -N- ((2S,3R) -1-amino-3-hydroxy-1-oxobutan-2-yl) -10- (4-aminobutyl) -16- (4-hydroxybenzyl) -7-isopropyl-6,9,12,15,18-pentaoxo-1,2-dithia-5,8,11,14,17-pentaazacycloicosane-4-carboxamide