rcs-8 rcs-8 rcs-8 (also known as 1-(2-cyclohexylethyl)-3-(2-methoxyphenylacetyl)indole, sr-18, and btm-8) is a synthetic cannabinoid that has been found as an ingredient of "herbal" synthetic cannabis blends. it can be described as an analogue of jwh-250 with the 1-pentyl group replaced by 1-(2-cyclohexylethyl), and can be expected to be less potent than jwh-250 (cf. jwh-007 and its cyclohexylethyl analogue). despite not having been reported in the scientific or patent literature as yet, reputed recreational use of rcs-8 in the united states has led to it being specifically listed in a proposed 2011 amendment to the controlled substances act, aiming to add a number of synthetic drugs into schedule i. in addition, all cb1 receptor agonists of the 3-phenylacetylindole class such as rcs-8 are schedule i controlled substances. rcs-8legal statuslegal status ca: schedule ii de: npsg (industrial and scientific use only) uk: class b us: schedule i identifiers iupac name 2-(2-methoxyphenyl)-1-ethanone cas number1345970-42-4 nchemspider24751863 yunii11030i5w3rcomptox dashboard (epa)dtxsid30158821 chemical and physical dataformulac25h29no2molar mass375.512 g·mol−13d model (jsmol)interactive image smiles coc1ccccc1cc(=o)c2cn(c3c2cccc3)ccc4ccccc4 inchi inchi=1s/c25h29no2/c1-28-25-14-8-5-11-20(25)17-24(27)22-18-26(23-13-7-6-12-21(22)23)16-15-19-9-3-2-4-10-19/h5-8,11-14,18-19h,2-4,9-10,15-17h2,1h3 ykey:bsqfbmxcqikyni-uhfffaoysa-n y ny (what is this?) (verify)