Medchemexpress, HY-18971 5mg TG4-155 CAS:1164462-05-8 TG4-155 is a potent, brain-permeant and selective EP2 receptor antagonist with a K i of 9.9 nM [1] [2] . TG4-155 shows low nanomolar antagonist activity against only EP2 and DP1 [1] . TG4-155 has an EP2 Schild K B of 2.4 nM and displays 550-4750-fold selectivity for EP2 over EP1, EP3, EP4 and IP, but only 14-fold selectivity against the DP1 receptor [2] . Purity:>98% Medchemexpress has over 10000 novel life-science reagents, reference compounds, APIs and natural compounds for laboratory and scientific use. Other quantity can also be offered.