MK571, also known as L660711, is a potent and selective competitive inhibitor of [3H]leukotriene D4 binding in guinea pig (Ki value, 0.22 nM) and human (Ki value, 2.1 nM) lung membranes but is essentially inactive versus [3H]leukotriene C4 binding (IC50 value in guinea pig lung, 23 microM).

MK-571 (L-660711) is a novel, potent, selective, orally bioactive antagonist of leukotriene D4 (LTD4) receptor with Kis of 0.22 and 2.1 nM in guinea pig and human lung membranes.

Lipoic Acid, formerly known as R-(+)-alpha-Lipoic acid, is an organosulfur compound derived from octanoic acid.