pccg-4 pccg-4 pccg-4 is a research drug which acts as a selective antagonist for the group ii metabotropic glutamate receptors (mglur2/3), with slight selectivity for mglur2 although not sufficient to distinguish mglur2 and mglur3 responses from each other. it is used in research into the function of the group ii metabotropic glutamate receptors. pccg-4identifiers iupac name (2s,1's,2's,3'r)-2-(2'carboxy-3'-phenylcyclopropyl)glycine pubchem cid5311344iuphar/bps3335chemspider4470843 ychemblchembl39573 ychemical and physical dataformulac12h13no4molar mass235.239 g·mol−13d model (jsmol)interactive image smiles c1=cc=c(c=c1)2(2c(=o)o)(c(=o)o)n inchi inchi=1s/c12h13no4/c13-10(12(16)17)8-7(9(8)11(14)15)6-4-2-1-3-5-6/h1-5,7-10h,13h2,(h,14,15)(h,16,17)/t7-,8+,9+,10+/m1/s1 ykey:iflwvshrwaivqf-katarqtjsa-n y (verify)