Methoextamine, it hasn't been in circulation for like a decade though as I think virtually the entire supply came out of China and they cracked down on those distributors. It's been ages since I've bought anything from any RC sites so I couldn't recommend where you might be able to get it and part of the draw used to be that it was dirt cheap while being a potential "This drug is so good it can ruin your life."
Like there was more disassociation than I'd attribute to E but as long as you kept the dosage reasonable I'd always get a nice wave of euphoria. Would sometimes go on jogs after doing a key bump and just marvel at the scenery.