fab-144 fab-144 fab-144 is an indazole-based synthetic cannabinoid that is presumed to be a potent agonist of the cb1 receptor and has been sold online as a designer drug. it is the indazole analogue of xlr-11. fab-144legal statuslegal status ca: schedule ii de: npsg (industrial and scientific use only) uk: class b identifiers iupac name 1-(5-fluoropentyl)-3-(2,2,3,3-tetramethylcyclopropanecarbonyl)-1h-indazole cas number2180935-79-7 ypubchem cid102135350chemspider32055552uniib9jt6f9x8vchemical and physical dataformulac20h27fn2omolar mass330.447 g·mol−13d model (jsmol)interactive image smiles fcccccn1n=c(c(c2c(c)(c)c2(c)c)=o)c3=c1c=cc=c3 inchi inchi=1s/c20h27fn2o/c1-19(2)18(20(19,3)4)17(24)16-14-10-6-7-11-15(14)23(22-16)13-9-5-8-12-21/h6-7,10-11,18h,5,8-9,12-13h2,1-4h3key:lvjqjruayxvegn-uhfffaoysa-n legal status sweden's public health agency suggested classifying fab-144 as a hazardous substance on november 10, 2014.