Comment by culi

Yeah I find this interesting too. A methyl group separates the street drug meth from the prescribed drug amphetamine. The main role that methyl group plays is the way it crosses the blood brain barrier. During the process of crossing the methyl group is lost. Which means with both meth and regular amphetamine the chemical that reaches your brain is the same.

I wonder if the dimethyl plays the same role here. Allowing it to cross the blood brain barrier faster