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下列化合物属于杂环化合物的是__________。
·<img src=\"https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1650078548125_631ba6798b0d47cda8a514aad9f91b74.png\" class=\"mw-100\">
·<img src=\"https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1650078552444_b4bb6b11cb174168a1c69c71358efa92.png\" class=\"mw-100\">
·<img src=\"https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1650078557389_0ae28e9f9d0c480282c3c8bf39400480.png\" class=\"mw-100\">
·<img src=\"https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1650078561153_9c25405439f14261ada8e7acd98e4795.png\" class=\"mw-100\">

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