High Quality Content by WIKIPEDIA articles! 4-Methylaminorex (4-MAR, 4-MAX) is a stimulant drug of the 2-amino-5-aryloxazoline class that was first synthesized in the 1950s by McNeil Laboratories. It is also known by its street names "U4Euh" ("Euphoria") and "Ice". It is banned in many countries as a stimulant.