题目内容

对肾上腺素能受体激动剂构效关系叙述正确的是

A. 苯环与侧链氨基相隔2个碳原子时作用较强
B. 苯环上引入羟基时作用强度增加
C. R-构型光学异构体活性较
D. 碳原子上引入甲基毒性降低
E. 侧链氨基上的烃基增大,B受体效应逐渐增强

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