MMDA-3b
MMDA-3b, also known as 4-methoxy-2,3-methylenedioxyamphetamine (4-MeO-2,3-MDA), is a psychedelic drug of the phenethylamine, amphetamine, and MDxx families related to ORTHO-MDA (2,3-MDA). It is the 4-methoxy derivative of ORTHO-MDA and is a positional isomer of MMDA (5-MeO-3,4-MDA) and related compounds like MMDA-2 (6-MeO-3,4-MDA) and MMDA-3a (2-MeO-3,4-MDA).