SUBSEQUENT REACTIONS OF 7-ETHOXYPYRMIDO[4,5-d]PYRIMIDINES: NUCLEOPHILIC EXCHANGE, PYRIMIDO[4,5:4',5']PYRIMIDO[1,2-a]QUINAZOLINES, BENZO[f]PYRIMIDO[4,5:4',5']PYRIMIDO[1,2-d][1,3,4]TRIAZEPINE

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