2-FDCK is the analog of Ketamine, the effect is very similar to MXP.
(Methoxphenidine, methoxydiphenidine, 2-MeO-Diphenidine)
Info from wikipedia:
The full chemical name of 2-FDCK is 2-(2-fluorophenyl)-2-(methylamino)cyclohexan-1-one.
2-FDCK belongs to a class of compounds called arylcyclohexylamines which contains various other drugs such as PCP and ketamine. Their general structure consists of a cyclohexylamine unit with an aryl group attached to the same carbon as the amine. 2-FDCK has an o-fluorophenyl group as an aryl substituent and the amine group is methylated. The cyclohexyl ring features a ketone group next to the amine position.
The chemical structure of 2-FDCK differs from ketamine only in that there is a fluorine atom attached to the phenyl group. Ketamine has a chlorine atom in that position.