L-Cysteinyl-L-cysteinyl-L-α-glutamyl-L-tyrosyl-L-cysteinyl-L-cysteinyl-L-asparaginyl-L-prolyl-L-alanyl-L-cysteinyl-L-threonylglycyl-L-cysteinyl-L-Tyrosine-d3 is a derivative of Linaclotide (L465880), a guanylate cyclase-C agonist currently being studied in Phase 3 trials for the treatment of irritable bowel syndrome with constipation.