Linaclotide Impurity 48 (Cyclic (1-2), (5-10) . (6-13) -tris (disulfide) )

(S) -5- (((S) -1- (((2S,5R,8S,14R,19R,22S,24aS,31R) -22- (2-amino-2-oxoethyl) -14- (((S) -1-carboxy-2- (4-hydroxyphenyl) ethyl) carbamoyl) -8- ((R) -1-hydroxyethyl) -2-methyl-3,6,9,12,20,23,24,30-octaoxotetracosahydro-1H,18H-19,5- (epiminopropanodithiomethano) pyrrolo[1,2-r][1,2]dithia[5,8,11,14,17,18,23]heptaazacyclohexacosin-31-yl) amino) -3- (4-hydroxyphenyl) -1-oxopropan-2-yl) amino) -4- ((4R,7S) -7-amino-6-oxo-1,2,5-dithiazocane-4-carboxamido) -5-oxopentanoic acid