140.1432 in α-PHP) also proposed which the hydroxylation happened either for the pyrrolidinyl ring or even the alkyl chain in the molecule. The precise placement on the hydroxylation couldn't be identified. 4F-MPH has an incredibly shorter record of recreational use. It was at first produced like a alternative for ethylphenidate https://4f-php20086.blog2learn.com/78247219/facts-about-4f-php-revealed