mepirapim mepirapim mepirapim is an indole-based cannabinoid which differs from jwh-018 by having a 4-methylpiperazine group in place of the naphthyl group and has been used as an active ingredient in synthetic cannabis products. it was first identified in japan in 2013, alongside fubimina. mepirapim acts as a t-type calcium channel inhibitor and is only minimally active at the central cb1 receptor. mepirapimlegal statuslegal status ca: schedule ii de: npsg (industrial and scientific use only) uk: class b identifiers iupac name (4-methylpiperazin-1-yl)-(1-pentylindol-3-yl)methanone cas number2365542-29-4pubchem cid101896603chemspider52085735uniiw6ozw1t05kchemical and physical dataformulac19h27n3omolar mass313.445 g·mol−13d model (jsmol)interactive image smiles cccccn1c=c(c2=cc=cc=c21)c(=o)n3ccn(cc3)c inchi inchi=1s/c19h27n3o/c1-3-4-7-10-22-15-17(16-8-5-6-9-18(16)22)19(23)21-13-11-20(2)12-14-21/h5-6,8-9,15h,3-4,7,10-14h2,1-2h3key:iueffeohjkcbpf-uhfffaoysa-n legality sweden's public health agency suggested to classify mepirapim as hazardous substance on november 10, 2014.