3NTZ:
reference: Design, synthesis, biological evaluation and X-ray crystal structure of novel classical 6,5,6-tricyclic benzo[4,5]thieno[2,3-d]pyrimidines as dual thymidylate synthase and dihydrofolate reductase inhibitors., Zhang X, Zhou X, Kisliuk RL, Piraino J, Cody V, Gangjee A, Bioorg Med Chem. 2011 Apr 9. PMID: 21550809

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