Linaclotide Dimer Impurity 45

3- ((2S,5R,8S,14R,21R,24S,27S,30R,33R,40R,43S,45aS) -43- (2-amino-2-oxoethyl) -33- ((S) -2- ((2S,5R,8S,14R,21R,24S,27S,30R,33R,40R,43S,45aS) -33-amino-43- (2-amino-2-oxoethyl) -27- (2-carboxyethyl) -24- (4-hydroxybenzyl) -8- ((R) -1-hydroxyethyl) -2-methyl-3,6,9,12,23,26,29,32,41,42,45,51-dodecaoxooctatriacontahydro-1H,20H,39H-40,21- (epiminomethano) -5,30- (methanotetrathiomethano) pyrrolo[1,2-t][1,2,3,4,29,30,31,32]octathia[7,10,13,16,19,20,23,36,39,42,45]undecaazacycloheptatetracontine-14-carboxamido) -3- (4-hydroxyphenyl) propanamido) -14- ((S) -3- (hydroxyamino) -4- (4-hydroxyphenyl) -2-oxobutanoyl) -24- (4-hydroxybenzyl) -8- ((R) -1-hydroxyethyl) -2-methyl-3,6,9,12,23,26,29,32,41,44,45,51-dodecaoxooctatriacontahydro-1H,20H,39H-40,21- (epiminomethano) -5,30- (methanotetrathiomethano) pyrrolo[1,2-t][1,2,3,4,29,30,31,32]octathia[7,10,13,16,19,20,25,36,39,42,45]undecaazacycloheptatetracontin-27-yl) propanoic acid