Propylphenidate

Propylphenidate (also known as PPH) is a piperidine based stimulant drug, closely related to methylphenidate, but with the methyl ester replaced by a propyl ester. It was banned in the UK as a Temporary Class Drug from April 2015 following its unapproved sale as a designer drug.
Legal status.
Propylphenidate is illegal in Sweden as of 26. January 2016.