Prohormones? Where the f did you get that idea? It's an estrogen suppressor. It's a prescription drug.
It is liquefied anastrozole a drug that blocks the growth of estrogen. We use it when on high doses of testosterone that will increase our own natural production of estrogen.
The whole "research only" thing will be a real longshot for you in court unless you have a legitamate home lab.
Now the likelyhood of LE taking an interest in you for ordering or receiving it is slim.