Phenylpiracetam
source:
https://en.m.wikipedia.org/wiki/PhenylpiracetamAn excerpt:
Rats administered 100 mg/kg phenylpiracetam performed, on average, 375% more work than rats given placebo, and consumed little non-preferred rat chow. In comparison, rats administered 1mg/kg d-amphetamine or 10 mg/kg methylphenidate performed, on average, 150% and 170% more work respectively, and consumed half as much non-preferred rat chow.