结构复杂 H2N COOCH2CH2N'H(C2H5)2CI CH 盐酸普鲁卡因 N 1,3,7-三甲基-2,6-二氧票黔 3. 7-trimethy l-2, 6-dioxgen-purine 咖啉因 Caffeine CH3„ 2、结构复杂： 盐酸普鲁卡因 咖啡因 Caffeine H2N COOCH2CH2N+H(C2H5)2 Cl￾N N N N H3C CH3 CH3 O O 1,3,7-trimethyl-2,6-dioxgen-purine 1,3,7-三甲基－2，6－二氧嘌呤