1LY3:
reference: Analysis of quinazoline and pyrido[2,3-d]pyrimidine N9-C10 reversed-bridge antifolates in complex with NADP+ and Pneumocystis carinii dihydrofolate reductase., Cody V, Galitsky N, Luft JR, Pangborn W, Queener SF, Gangjee A, Acta Crystallogr D Biol Crystallogr 2002 Sep;58(Pt 9):1393-9. PMID: 12198294

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