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- [2] STUDIES ON FUSED PYRIMIDINE-DERIVATIVES .12. REACTION OF 6-(ALK-2-ENYLAMINO)-5-FORMYL-1,3-DIMETHYLPYRIMIDINE-2,4(1H,3H)-DIONES WITH ALPHA-AMINO-ACID DERIVATIVES JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 1, 1994, (05): : 557 - 564