ChemInform Abstract: POLYAZA STEROIDS. II. 1,2,4-TRIAZOLO(3′,4′:2,3)PYRIMIDO(4,5-C)QUINOLIN 11(12H)ONES, IMIDAZO(2′,1′:2,3)PYRIMIDO(4,5-C)QUINOLIN-11(12H)ONES AND 2,3-DIHYDROIMIDAZO(2′,1′:2,3)PYRIMIDO(4,5-C)QUINOLIN-11(12H)ONES

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