5f-ab-pinaca 5f-ab-pinaca 5f-ab-pinaca is an indazole-based synthetic cannabinoid that is derived from a series of compounds originally developed by pfizer in 2009 as an analgesic medication, and has been sold online as a designer drug. not to be confused with 5f-apinaca. 5f-ab-pinacalegal statuslegal status ca: schedule ii de: anlage ii (authorized trade only, not prescriptible) uk: class b us: schedule i illegal in china and singapore identifiers iupac name n--1-(5-fluoropentyl)indazole-3-carboxamide cas number1800101-60-3pubchem cid91936927chemspider29763723unii3l83b2298vcomptox dashboard (epa)dtxsid401009970 chemical and physical dataformulac18h25fn4o2molar mass348.422 g·mol−13d model (jsmol)interactive image smiles cc(c)(nc(=o)c1nn(cccccf)c2ccccc12)c(n)=o inchi inchi=1s/c18h25fn4o2/c1-12(2)15(17(20)24)21-18(25)16-13-8-4-5-9-14(13)23(22-16)11-7-3-6-10-19/h4-5,8-9,12,15h,3,6-7,10-11h2,1-2h3,(h2,20,24)(h,21,25)/t15-/m0/s1key:wcbyxibepfzubg-hnnxbmfysa-n 5f-ab-pinaca has been reported to be a potent agonist of the cb1 receptor and cb2 receptor with ec50 values of 0.48 nm and 2.6 nm respectively. its metabolism has been described in literature. legality china as of october 2015 5f-ab-pinaca is a controlled substance in china. germany 5f-ab-pinaca is an anlage ii controlled substance in germany as of may 2015. singapore it is also controlled under the fifth schedule of the misuse of drugs act (mda) in singapore as of may 2015.