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Methiopropamine(MPA) is a stimulant structurally similar to methamphetamine, but with a thiophene ring instead of a benzene ring. The replacement of a thiophenyl group with a phenyl group means that MPA is 1/4 the strength of amphetamine and 1/6 the strength of methamphetamine. Unlike methamphetamine, amphetamine and methiopropamine are safe to use. Methiopropamine is safe long term.
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