Ring systems that contain both a pyridine ring and another fused ring structure.
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2,3-dimethyl-5-(pentafluoroethyl)-6-(2-sulfanylbenzoyl)-3H-imidazo[4,5-b]pyridine
1-(4-Chloro-phenyl)-8-methyl-1H-benzo[b][1,8]naphthyridin-2-one
