o-1656 o-1656 o-1656 is a cannabinoid agonist which was invented by billy r martin and raj k razdan at organix inc in 2002. it is moderately selective for the cb2 receptor with a cb1 receptor affinity of 18 nm and a cb2 receptor affinity of 2 nm. since it has a cycloheptyl ring attached to the phenol core, it falls outside the definition of a "cyclohexylphenol derivative", but may still be controlled by generic legislation in some jurisdictions. o-1656clinical dataatc codenoneidentifiers iupac name 2-cycloheptyl-5-(2-methyloctan-2-yl)benzene-1,3-diol cas number468083-75-2pubchem cid58803980chemical and physical dataformulac22h36o2molar mass332.528 g·mol−13d model (jsmol)interactive image smiles ccccccc(c)(c)c1=cc(=c(c(=c1)o)c2cccccc2)o inchi inchi=1s/c22h36o2/c1-4-5-6-11-14-22(2,3)18-15-19(23)21(20(24)16-18)17-12-9-7-8-10-13-17/h15-17,23-24h,4-14h2,1-3h3key:aeczebwfcjessn-uhfffaoysa-n