The chemical fomula of mercaptopurine is C5H4N4S.

Though 6-mercaptopurine(Mercaptopurine, 6-MP or its brand name Purinethol) is not a preferred drug for acute leukemia, but it is used in combination with other medicines as maintenance treatment of this disease. 6-mercaptopurine can extend the remission of the disease and increase the chances of survival for a patient. See the related link for further information that may be helpful for you.

No - not recommended at all. Mercaptopurine can (and usually does to some degree) cause hematologic toxicity in the form of anemia, neutropenia, pancytopenia, and thrombocytopenia. You need to keep what you have. :)

Drug called 6 mercaptopurine

Mercaptopurine (MP6) (Purinethol) is made by Teva Pharmaceuticals also known as Novopharm.

http://www.tevapharm.com/

Resources:

http://www.canadapharmacy.com/index.cfm/fuseaction/product/product_id/1762.htm