(E/Z)-CLH304a
(E/Z)-CLH304a (GABAB receptor antagonist 1) is a mixture of (E)-CLH304a and (Z)-CLH304a. (E)-CLH304a (CLH304a; HY-129636) is a specific and noncompetitive GABAB receptor negative allosteric modulator (NAM). CLH304a inhibits Baclofen (HY-B0007)-induced ERK1/2 phosphorylation in HEK293 cells overexpressing GABAB receptors.