ChemInform Abstract: NOVEL HETEROCYCLIC RING SYSTEMS- SYNTHESIS OF 1,2,7,8-TETRAHYDRO-3H(1,3)OXAZINO(6,5-H)QUINAZOLINE-7-ONES AND 3,4,7,8,9,10-HEXAHYDRO-2H,6H(1,3)BISOXAZINO(5,6-F-5′,6′-H)QUINAZOLINE-9-ONE

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