140.1432 in α-PHP) also instructed that the hydroxylation happened either at the pyrrolidinyl ring or maybe the alkyl chain in the molecule. The precise place on the hydroxylation couldn't be determined. 4F-MPH has a very shorter record of recreational use. It was at first created like a replacement for ethylphenidate https://4f-php21898.blogoxo.com/30379462/5-essential-elements-for-4f-php