mchb-1 mchb-1 mchb-1 is a benzimidazole derived drug which was researched as an analgesic but never developed for medical use. it acts as a potent agonist of the cb2 receptor, with an ec50 of 0.52nm at cb2, and ~30x selectivity over cb1 (ki of 110nm at cb1 vs 3.7nm at cb2). it has been sold online as a designer drug, first being identified in germany in december 2013. mchb-1identifiers iupac name 2-(4-ethoxybenzyl)-1-(cyclohexylmethyl)-n,n-diethyl-1h-benzoimidazole-5-carboxamide cas number1046140-32-2pubchem cid44561533uniiw8qny2t4ycchemblchembl470965chemical and physical dataformulac28h37n3o2molar mass447.623 g·mol−13d model (jsmol)interactive image smiles ccn(cc)c(=o)c1=cc2=c(c=c1)n(c(=n2)cc3=cc=c(c=c3)occ)cc4ccccc4 inchi inchi=1s/c28h37n3o2/c1-4-30(5-2)28(32)23-14-17-26-25(19-23)29-27(31(26)20-22-10-8-7-9-11-22)18-21-12-15-24(16-13-21)33-6-3/h12-17,19,22h,4-11,18,20h2,1-3h3key:wrvzbxhtuopqjs-uhfffaoysa-n