短语词组短语Aza -Semi-Crown-Ether 氮杂半冠醚Dibenzo -21-crown 7-Ether 二苯并Dicyclohexano -18-crown 6-Ether 顺;二环己烷并4 -Carboxybenzo-15-crown 5-Ether 碳酸苯并dibenzo -18-crown-6 ether crosslinked chitosan 冠醚交联壳聚糖aza -crown ether 氮杂冠醚 返回 crown ether