nitrosourea

noun

ni·​tro·​so·​urea -yu̇-ˈrē-ə 

: any of a group of lipid-soluble antineoplastic drugs that function as alkylating agents with the ability to cross the blood-brain barrier

The response of most gliomas to chemotherapy is limited, but the addition of nitrosourea or procarbazine to radiation therapy increases the survival of some patients with high-grade gliomas.

—Scientfic American Medicine Bulletin

see carmustine