alpha,n,o-tms alpha,n,o-tms alpha,n,o-tms, or α,n-dimethyl-5-methoxytryptamine, is a lesser-known psychedelic drug. its abbreviated nomenclature is derived from its structure, as it is α,n,o-trimethyl serotonin. α,n,o-tms was first synthesized by alexander shulgin. in his book tihkal (tryptamines i have known and loved), shulgin lists the dosage as 10-20 mg when taken orally, and the duration as 6–8 hours. alpha,n,o-tmsidentifiers iupac name (methyl)amine cas number4822-13-3 ypubchem cid20961chemspider19718 yuniipj8wt93mnqchemical and physical dataformulac13h18n2omolar mass218.300 g·mol−13d model (jsmol)interactive image smiles o(c1cc2c(cc1)cc2cc(nc)c)c inchi inchi=1s/c13h18n2o/c1-9(14-2)6-10-8-15-13-5-4-11(16-3)7-12(10)13/h4-5,7-9,14-15h,6h2,1-3h3 ykey:iyemyzolblhkfe-uhfffaoysa-n y (verify)