Linaclotide Aspartic Acid Impurity

Chemical Name: (2S)-2-((3S,6R,9R,15R,20R,23S,26S,29R,32R,37R,40S,45aS)-32-amino-26-(2-carboxyethyl)-40-(carboxymethyl)-23-(4-hydroxybenzyl)-9-(1-hydroxyethyl)-3-methyl-1,4,7,10,13,22,25,28,31,38,41,47-dodecaoxotetracontahydro-1H-37,20-(epiminomethano)-6,29-(methanodithiomethano)pyrrolo[2,1-s][1,2,27,28,5,8,11,14,17,20,23,32,35,38,41]tetrathiaundecaazacyclotritetracontine-15-carboxamido)-3-(4-hydroxyphenyl)propanoic acid