L-Asp7 Linaclotide Impurity

Chemical Name: 3-(25-Amino-6-((1-carboxy-2-(4-hydroxyphenyl)ethyl)carbamoyl)-38-(2-carboxyethyl)-35-(4-hydroxybenzyl)-12-(1-hydroxyethyl)-8,11,14,22,24,32,34,37,40-nonaoxo-15-(2-propionamidopropanamido)-3,4,17,18,27,28-hexathia-7,10,13,23,31,33,36,39-octaazabicyclo[18.12.8]tetracontane-30-carboxamido)-4-cyclopentyl-4-oxobutanoic acid