1MVS:
reference: Analysis of two polymorphic forms of a pyrido[2,3-d]pyrimidine N9-C10 reversed-bridge antifolate binary complex with human dihydrofolate reductase., Cody V, Galitsky N, Luft JR, Pangborn W, Gangjee A, Acta Crystallogr D Biol Crystallogr 2003 Apr;59(Pt 4):654-61. PMID: 12657784

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