A term used to describe a ring system where two or more rings share two adjacent carbon atoms.
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2-phenyl-5-methylthio-7-phenythiazolo<3,4-b><1,2,4>triazolia-1(3)-ide
(S)-2,3-dihydro-2-phenylbenzo[g]imidazo[2,1-a]phthalazin-4-ium-6-olate
