H 吡啶 吡喃 嘧啶 吡嗪 吲哚 (pyridine) (pyran) (pyrimidine) (pyrazine) (indole) N N N 喹啉 异喹啉 嘌呤 苯并噻唑 (quinoline) (isoquinoline) (purine) (benzothiazole) 吡啶 吡喃 嘧啶 吡嗪 吲哚 (pyridine) (pyran) (pyrimidine) (pyrazine) (indole) N H N O N N N N N N S N N N N N H 喹啉 异喹啉 嘌呤 苯并噻唑 (quinoline) (isoquinoline) (purine) (benzothiazole)