(+)-3-[[(4-Fluorophenyl)sulfonyl]methylamino]-1,2,3,4-tetrahydro-9H-carbazole-9-acetic acid

CAY10471 Racemate (TM30089 Racemate) is a potent and highly selective prostaglandin D2 receptor CRTH2 antagonist, with a Ki of 0.6 nM for hCRTH2, selective over human thromboxane A2 receptor TP (Ki, >10000 nM) or PGD2 receptor DP (Ki, 1200 nM). CAY10471 Racemate also has effect on mouse and rat orthologs of CRTH2[1].

TM30089 is a ramatroban analog and an orally active, high-affinity, potent and selective prostaglandin D2 receptor 2 (DP2; CRTH2) antagonist (Ki = 0.6 nM/hDP2 against 1.2 nM PGD2; Ki = 1.2 μM/hDP1 against 0.5 nM PGD2, >10 μM/hTP against 5 nM SQ29548) th at blocks PGD2-induced responses in hDP2 transfectants (IP1/βarr IC50 = 1.2/3.0 nM) and exhibits in vivo efficacy in a murine model of renal tubulointerstitial fibrosis (20 mg/kg b.i.d. p.o., starting 4 days before or 3 days after unilateral ureteral obstruction/UUO).

CRTH2: 0.6 nM (Ki)

[1] Ulven T, et al. Minor structural modifications convert the dual TP/CRTH2 antagonist ramatroban into a highly selective and potent CRTH2 antagonist. J Med Chem. 2005 Feb 24;48(4):897-900. DOI:10.1021/jm049036i