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From: MDBG CC-CEDICT Chinese-English Dictionary 漢英字典

 吖嗪 [ㄚ ㄑㄧㄣˊ; a1 qin2]
 -azine
 heterocyclic compound containing nitrogen in their ring such as pyridine 吡啶[ㄅㄧˇ ㄉㄧㄥˋ; bi3 ding4] C5H5N, pyrazine 哒嗪[ㄉㄚ ㄑㄧㄣˊ; da1 qin2] C4H4N2 or pyrimidine 嘧啶[ㄇㄧˋ ㄉㄧㄥˋ; mi4 ding4] C4H4N2