Thiothinone, also known as β-ketomethiopropamine or βk-methiopropamine (βk-MPA) is a stimulant that is the β-keto-substituted analog of methiopropamine and has been sold online as a designer drug.

[1][2][3] It is structurally related to methcathinone however the phenyl group has been substituted for thiophene instead.

Thiothinone was also reported to be a pyrolysis product of methiopropamine.

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