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3-substituted 2-methyl pyrimido5,4-ccinnoline-4(3H)one and its derivatives and method of manufacture of 3-substituted 2-methyl pyrimido5,4-ccinnoline-4(3H)one and its derivatives
3-substituted 2-methyl pyrimido5,4-ccinnoline-4(3H)one and its derivatives and method of manufacture of 3-substituted 2-methyl pyrimido5,4-ccinnoline-4(3H)one and its derivatives