Journal of Heterocyclic Chemistry
Volume 22, Issue 5, pages 1369–1372, September/October 1985
Synthesis of selected 3-substituted-pyrimido[5,4-e]1,2,4-triazine-5,7-diamines as potential folate antagonists†
Leslie M. Werbel, Edward F. Elslager, Judith L. Johnson
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http://dx.doi.org/10.1002/jhet.5570220547