EL-MAHDY, K. Synthesis of Some New Tetracyclic Pyrimidine Derivatives Using Exocyclic α,β-Unsaturated Ketone and Evaluation of Their Antitumor Activities. JOURNAL OF ADVANCES IN CHEMISTRY, [S. l.], v. 4, n. 1, p. 311–317, 2008. DOI: 10.24297/jac.v4i1.960. Disponível em: https://rajpub.com/index.php/jac/article/view/960. Acesso em: 7 may. 2024.