... LC/MS analyses of MDAs in the forms of tablets and those for GC/MS analysis of MDAs and their main metabolites 4-hydroxy-3-me- thoxymethamphetamine ( HMMA) and 4-hydroxy-3-methoxyamphetamine ( HMA) ... simultaneou determination of amphetamine, methamphetamine, 3,4-methylenedioxyamphetamine, 3,4-methylenedioxymethamphetamine, and 3,4-methylenedioxyethyl- amphe tamine in urine by solid-phase extraction ... metabolic pathway of MDMA in humans is the 3,4-Methylenedioxyamphetamines 234 3,4-Methylene dioxyamphetamines Mass spectra of TFA derivatives of MDA, MDMA, MDEA, MBDB and HMDMA obtained by GC/MS....