fub-144 fub-144 fub-144 (also known as fub-ur-144) is an indole-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 an analogue of ur-144 and xlr-11 where the pentyl chain has been replaced with fluorobenzyl. fub-144legal statuslegal status ca: schedule ii de: npsg (industrial and scientific use only) uk: class b us: schedule i identifiers iupac name (2,2,3,3-tetramethylcyclopropyl)methanone cas number2185863-15-2 ypubchem cid118796439chemspider30646792uniiiwy4w66okwchemical and physical dataformulac23h24fnomolar mass349.449 g·mol−13d model (jsmol)interactive image smiles fc1ccc(cc1)cn1cc(c2c1cccc2)c(=o)c1c(c1(c)c)(c)c inchi inchi=1s/c23h24fno/c1-22(2)21(23(22,3)4)20(26)18-14-25(19-8-6-5-7-17(18)19)13-15-9-11-16(24)12-10-15/h5-12,14,21h,13h2,1-4h3key:uxofeilqvzflrh-uhfffaoysa-n legal status in the united states, fub-144 was temporarily emergency scheduled by the dea in 2019. and made a permanent schedule i controlled substance on april 7, 2022. sweden's public health agency suggested classifying fub-144 as hazardous substance on march 24, 2015.