Did you notice that you won't be able to synthesize the inactive 3,4-dimethoxyphenetylamine (3,4-DMPEA) from 3,4-DMP2P but could well prepare 3,4-dimethoxyamphetamine (3,4-DMA) or 3,4-dimethoxymethamphetamine (3,4-DMMA) from it? Just use a molar equivalent amount of 3,4-DMP2P in place of 3,4-MDP2P in any synthesis of MDA/MDMA. I'm sure there are many including me who would wish to hear about the effects of those two substances. Even PIHKAL is vague about them.