CYM5541 (S6552-GRP)

CYM5541 (ML249) is a selective, allosteric agonist of S1P3 with an EC50 of between 72 and 132 nM and exhibits exquisite selectivity over other S1P receptor subtypes in vitro: S1P1 EC50 > 10 μM, S1P2 EC50 > 50 μM, S1P4 EC50 > 50 μM, and S1P5 EC50 > 25 μM.