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