Isopropylamphetamine?

[Bwiti]

I was just dicking around at

http://gb.espacenet.com/

when I came across an interesting patent; GB508756. According to the patent, allylamphetamine and benzylamphetamine are active stimulants. My question is, can anyone see a reason why isopropylamphetamine wouldn't be active? Is any amphetamine made with a primary amine scheduled? Peace!
  ChemGrrl is in a beautiful place, and she hears our prayers.