Regiospecific syntheses of the three monomethylthio analogues of 1-(2, 4, 5- trimethoxypheny1)-2-aminopropane are described. The three isomeric amines were evaluated for potential psychotomimetic potency using the rabbit hyperthermia assay. Enantiomeric compositions and time-concentration curves in rat brains were determined following intraperitoneal administration of each compound. The biological data are ...