I think it is fl-modafinil and I’m not arsed about recreation, I’m trying to combat long-term fatigue.The dosage from some of the analogues (I can't remember what the code negrogesic mentioned refers to, is it fl-modafinil?) is less than modafinil, adrafinil is more since it's just a prodrug. But in my experience, the effects aren't much different. None of them are particularly recreational, they just keep you awake, and give you a little energy and motivation. Pretty decent functional stimulants, but not really "fun" drugs.
We currently have a lot of fluorenol around, which is said to be similar like modafinil (which would rule it out for me, I am with those who get a jittery caffeine OD like effect from it). It has an interesting structure, which reminds me a bit of tricyclic antidepressants (not that I'd like them too much either). Dosage seems to be around 1/2 of modafinil from what I read.