Propylamphetamine CAS # 51799-32-7 is a chemical of the phenethylamine and amphetamine chemical groups that serves as a stimulant, psychoactive substance and study chemical. In the 1970s, it was first developed, mainly for research into the metabolism of other amphetamines and as a comparison tool. Propylamphetamine was found to be 1/4 as strong as amphetamine in a study in rats.