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Synthesis and Structure-Antitumor Activity of 4,6-Diamino-1,2-Dihydro-2 ,2-Dimethyl-1-(Substituted-N
Introduction 4,6-Diamino-1,2-dihydro-2,2-dimethyl-1-substituted-1,3,5-triazines (Ⅰ) are dihydrofolate reductase(DHFR) i......