sentences:  Very little data exists about the pharmacological properties, metabolism, and toxicity of MDDM.This compound is however occasionally encountered as an impurity in 3,4-methylenedioxy-"N"-methylamphetamine (MDMA) which has been synthesized by methylation of MDA using methylating reagents such as methyl iodide.An excess of reagent or a reaction temperature that is too high results in some double methylation of the amine nitrogen, yielding MDDM as well as MDMA.