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The graphic looks to be, emulating Shulgin's own naming scheme for the compounds that he had synthesized, DMMDMA, and not actually not DMMDA. I don't think DMMDMA was ever synthesized, despite being the logical mixture of MDMA and the 2C series of chemicals he synthesized.
"Several people have asked me what I thought about the potential activity of a compound with a methyl group added to DMMDA. One of these possibilities would be the N-methylated derivative, 2,5-dimethoxy-N-methyl-3,4-methylenedioxyamphetamine, or METHYL-DMMDA (or DMMDMA for the dimethoxy-methylenedioxy-methamphetamine nomenclature). It is a MDMA analogue, and is described in the recipe for METHYL-MMDA-2." & "DMMDMA has not yet been launched into an evaluation program, and I wouldn't be surprised if the needed dosage might be up there somewhere over 100 milligrams. I feel quite sure that the answers may be known in the near future. There is a surprisingly large number of inconspicuous chemical explorers out there all over the world, doing their synthetic thing in their private laboratories. They are truly the astronauts of inner space" -- From PIHKAL, Alexander Shulgin 188.8.131.52 (talk) 21:54, 26 April 2014 (UTC)