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最外层电子数相等的原子、离子或分子叫做经典的电子等排体 classic isosteres ; 外围电子数目相同或排列相似,具有相同生物活性或拮抗生物活性的原子、基团或部分结构,即为生物电子等排体或非经典的电子等排体 nonclassic isosteres或bioisosteres。Burger提出的classic isosteres根据价态进行了分类,下面是最常用的一价和二价的。谈一谈这些药物设计理论在麻醉药一章中体现在那些药物的设计上,请给出至少1例,给出变化前后的结构,并将变化的部分圈出。 1. Univalent atoms and groups a. CH 3 NH 2 OH F b. Cl PH 2 SH c. Br i-Pr d. I t-Bu 2. Bivalent atoms and groups a. -CH 2 - -NH- -O- -S- -Se- b. -COCH 2 R -CONHR -CO 2 R -COSR
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