<unk> (oral) is a antineoplastic agent that is FDA approved for the treatment of chronic myelogenous leukemia (myeloid, myelocytic, granulocytic). There is a Black Box Warning for this drug as shown here.  Common adverse reactions include rash, abdominal pain, constipation, diarrhea, nausea, stomatitis, vomiting, asthenia, dizziness, and headache.
Busulfan 
Mafosfamide
Ifosfamide
Carmustine 
Lomustine
Cladribine
Satraplatin
Idoxuridine