a system of multiple rings that share two or more common atoms
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2-butyl-3-benzoylimidazo[1,2-a]pyridine
4H-Pyrano[2,3-b]pyridine-6,6(7H)-dicarbonitrile, 3-acetyl-5-amino-2-methyl-4,7-diphenyl-
THIENO[3,2-B]THIOPHENE-2-CARBOXYLIC ACID
2-phenyl-4-(2-fluorophenyl)-4H-imidazo[4,5-b]quinoxaline
N-2,1,3-BENZOTHIADIAZOL-4-YL-2,2,2-TRIFLUOROACETAMIDE
ethyl 5-methoxy-2-methyl-1-phenyl-1H-indole-3-carboxylate
