a-2b receptor antagonist 2

A2B receptor antagonist 2 is an antagonist of adenosine receptor A2B (Ki = 2.30 μM for rA1, 6.8 μM for rA2A, 3.44 μM for hA2B).

MK-3207 is a highly potent and orally bioavailable small molecule antagonist of the calcitonin gene-related peptide (CGRP) receptor, demonstrating an in vitro IC50 of 0.12 nM and a Ki of 0.024 nM for the human receptor with exceptional selectivity over the related human AM1, AM2, CTR, and AMY3 receptors, though it exhibits lower affinity for CGRP receptors from other species such as canine and rodent; in vitro studies confirm its potent antagonism of human and rhesus monkey CGRP receptors (K(i) = 0.024 nM), and in vivo models show it produces a concentration-dependent inhibition of dermal vasodilation, requiring plasma concentrations of 0.8 nM and 7 nM to block 50% and 90% of the blood flow increase, respectively.

A1AR antagonist 2 (compound 18h) is a potent antagonist of the A1 adenosine receptor (AR) with Ki values of 1.49, 10.2, and 50.1 nM for hA1, hA2A, and hA2B, respectively [1].