3 4-methylenedioxypyrovalerone July 8, 2019 16 32 64 128 3 4 methylenedioxypyrovalerone mdpv 3 4-methylenedioxypropiophenone 3 4-methylenedioxyphenyl 3 4-(methylenedioxy)aniline 3 4-methylenedioxyphenyl-2-propanone