Word Count : 129

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(i) Pyrazino[2,3-c]pyridazine is a fused bicyclic heteroaromatic system consisting of a six-membered pyrazine ring (1,4-diazine) fused to a six-membered pyridazine ring (1,2-diazine) along the 2,3-positions of the pyrazine and the c-face of ________ _____ ___ __________ ______ ___ ___ _______ _____.
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