This substance is known as alpha-Pyrrolidinobutiophenone and is similar with α-Pyrrolidinopropiophenone but has longer side chain.
I received it as as fine brown powder from a close friend - he did a HPLC and it turned to be 98.5 % purity. On the way from post office i opend packet and eyeballed something like 20 mg on foil and chased it, hold for 4 seconds and exhale. Immediate rush came. The character of rush is similar to MDPV, but a little more calm. I went to my apartment and smoked it in tokes of 20 mg until it is gone. It is very pro-sexual substance, gives paranoia a little bit similar to MDPV but not so big, when it was all gone i ate 4 mg phenazepam and went for a walk, slept easily, but pphenazepam made my next day very sleepy.
As now i'm familiar with alpha-ppp, alpha-pbp and alpha-pvp and mdpv i can make a conclusion, that two cabon side chain make subtance more potent but the peak of action is gently sloping. Also pvp and mdpv has a long going side effects as a paranoia. It is on my top 1 place in cathinones rang.