Write the structures of the following compounds:
(i) Pyrazino [2, 3,-c] pyridazine
(ii) 2-Methylazacyclohexane
(iii) 2,5-Diazaanthracene
(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 ________ __________ ____ __________ _____ ________ ___ _________ ____.
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Write the structures of the following compounds:
(i) Pyrazino [2, 3,-c] pyridazine
(ii) 2-Methylazacyclohexane
(iii) 2,5-Diazaanthracene
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