140.1432 in α-PHP) also suggested the hydroxylation happened either at the pyrrolidinyl ring or the alkyl chain with the molecule. The exact place with the hydroxylation could not be decided. 4F-MPH has an extremely short record of recreational use. It had been originally produced to be a substitute for ethylphenidate https://4fphp42086.livebloggs.com/36458534/5-simple-statements-about-4f-php-explained