140.1432 in α-PHP) also proposed which the hydroxylation occurred both on the pyrrolidinyl ring or the alkyl chain on the molecule. The precise position in the hydroxylation couldn't be determined. 4F-MPH has an especially small record of recreational use. It was originally formulated to be a replacement for ethylphenidate which https://4f-php35789.59bloggers.com/30647145/the-basic-principles-of-4f-php