methylbutyltryptamine methylbutyltryptamine mbt, or n-methyl-n-butyltryptamine, is a lesser-known psychedelic drug. mbt was first synthesized by alexander shulgin. in his book tihkal (tryptamines i have known and loved), the minimum dosage is listed as 250-400 mg, and the duration listed as 4–6 hours. mbt produces a heavy body load with dehydration, and causes visuals similar to those of dmt. very little data exists about the pharmacological properties, metabolism, and toxicity of mbt. methylbutyltryptamineidentifiers iupac name n--n-methylbutan-1-amine cas number848130-12-1 ypubchem cid44719457chemspider21106349uniiuq2k8w783scomptox dashboard (epa)dtxsid501016744chemical and physical dataformulac15h22n2molar mass230.355 g·mol−13d model (jsmol)interactive image smiles ccccn(c)ccc1=cnc2=cc=cc=c21 inchi inchi=1s/c15h22n2/c1-3-4-10-17(2)11-9-13-12-16-15-8-6-5-7-14(13)15/h5-8,12,16h,3-4,9-11h2,1-2h3key:pueyinpkmcbjca-uhfffaoysa-n msbt tihkal mentions that a structural isomer of mbt exists, with the butyl group attached at the nitrogen atom. it is known as n-s-butyl-n-methyltryptamine, or msbt. however, little is known about its psychoactivity.