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- [9] SYNTHESIS OF A NOVEL 5-DEAZA-5-THIA ANALOG OF TETRAHYDROFOLIC ACID, N-(P-([(2-AMINO-6,7-DIHYDRO-4-OXO-3H,8H-PYRIMIDO[5,4-B][1,4]THIAZIN-6-YL)METHYL]AMINO)BENZOYL)GLUTAMIC ACID JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 1, 1994, (07): : 833 - 836