5-meo-ept 5-meo-ept 5-meo-ept is a psychedelic tryptamine derivative which has been sold as a designer drug. 5-meo-eptlegal statuslegal status de: npsg (industrial and scientific use only) uk: class a illegal in singapore and japan identifiers iupac name n-ethyl-n-propan-1-amine cas number850032-67-6pubchem cid74405226chemspider52083392unii138i4b27p7chemical and physical dataformulac16h24n2omolar mass260.381 g·mol−13d model (jsmol)interactive image smiles cccn(cc)ccc1=cnc2=c1c=c(c=c2)oc inchi inchi=1s/c16h24n2o/c1-4-9-18(5-2)10-8-13-12-17-16-7-6-14(19-3)11-15(13)16/h6-7,11-12,17h,4-5,8-10h2,1-3h3key:oqhfiokngnjppf-uhfffaoysa-n legality 5-meo-ept is illegal in singapore and japan, as well as falling within the scope of drug analogue laws in a number of other jurisdictions.