When it comes to partygoers, the first thing that comes to mind is having a good time. But with all the different types of research chemicals out there, it can be difficult to know what is safe and what is not. A chemical that is becoming increasingly popular among partygoers is arylcyclohexylamine, or ACH such as 2FDCK or OPCE. It is an analogue of methamphetamine that can give users a euphoric high, but it also carries some serious risks, which is why we recommend using it for research purposes only.