Leslie M. Werbel, Linda Newton, Edward F. Elslager; Folate Antagonists. 17. Synthesis and Biological Properties of a 2,4-Diamino-6-thioquinazoline Analog of Aminopterin; Journal of Heterocyclic Chemistry; English; 17; 1980; 497 - 500
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https://www.jhetchem.com/cd2html.php?file=19800497
