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吖嗪
āqín
1. -azine
2. heterocyclic compound containing nitrogen in their ring such as pyridine [[吡啶<bǐdìng>]] C5H5N, pyrazine [[噠嗪|哒嗪<dāqín>]] C4H4N2 or pyrimidine [[嘧啶<mìdìng>]] C4H4N2