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Pyridino[2,3-d]pyridazine is a fused heterocyclic compound consisting of a pyridine ring fused with a pyridazine ring. The pyridine ring is a six-membered aromatic ring containing one nitrogen atom, while the pyridazine ring is also six-membered but contains two adjacent nitrogen atoms. In the [2,3-d] fusion, __________ ________ _________ _______ __________ ___ ___ ________ ______ _____ _____.
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