Refers to a class of heterocyclic compounds with a fused pyridine and pyrimidine ring system.
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1,3,8,8-tetramethyl-5-(3-hydroxyphenyl)-5,8,9,10-tetrahydropyrimido[4,5-b]quinoline-2,4,6(1H,3H,7H)-trione
5-(4-Methoxyphenyl)-1,3-dimethyl-2,4-dioxo-7-phenyl-1,2,3,4-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile
