px-2 px-2 px-2 (also known as 5f-app-pinaca, fu-px and ppa(n)-2201) is an indazole-based synthetic cannabinoid that has been sold online as a designer drug. it contains a phenylalanine amino acid amide as part of its structure. px-2legal statuslegal status ca: schedule ii de: npsg (industrial and scientific use only) uk: class b illegal in china, singapore, sweden identifiers iupac name (s)-n-(1-amino-1-oxo-3-phenylpropan-2-yl)-1-(5-fluoropentyl)-1h-indazole-3-carboxamide cas number2365471-47-0 ychemspider32741702uniimj9uwe9qarchemical and physical dataformulac22h25fn4o2molar mass396.466 g·mol−13d model (jsmol)interactive image smiles o=c(n(c(n)=o)cc1=cc=cc=c1)c2=nn(cccccf)c3=c2c=cc=c3 inchi inchi=1s/c22h25fn4o2/c23-13-7-2-8-14-27-19-12-6-5-11-17(19)20(26-27)22(29)25-18(21(24)28)15-16-9-3-1-4-10-16/h1,3-6,9-12,18h,2,7-8,13-15h2,(h2,24,28)(h,25,29)/t18-/m1/s1key:ojtahwmzbjrsir-gosisdbhsa-n legality sweden's public health agency suggested classifying px-2 as hazardous substance on november 10, 2014. px-2 is listed in the fifth schedule of the misuse of drugs act (mda) and therefore illegal in singapore as of may 2015. as of october 2015 px-2 is a controlled substance in china.