6-Mercaptopurine hydrate (Standard) is the analytical standard of 6-Mercaptopurine hydrate. This product is intended for research and analytical applications. 6-Mercaptopurine hydrate (Mercaptopurine hydrate, 6-MP hydrate) is a purine analogue which acts as an antagonist of the endogenous purines and has been widely used as antileukemic agent and immunosuppressive agent.