The present invention relates to substantially pure piperidine derivative compounds of formulae (I) or (II)
wherein R1 is hydrogen or hydroxy; R2 is hydrogen; or R1 and R2 taken together form a second bond between the carbon atoms bearing R1 and R2; R3 is -COOH or -COOR4; R4 has 1 to 6 carbon atoms; A, B, and D are the substituents of their respective rings each of which may be different or the same and are hydrogen, halogens, alkyl, hydroxy, alkoxy, or other substituents.
本发明涉及式 (I) 或 (II) 的基本纯的
哌啶衍
生物化合物
其中 R1 是氢或羟基;R2 是氢;或 R1 和 R2 一起在带有 R1 和 R2 的碳原子之间形成第二键;R3 是 -COOH 或 -COOR4;R4 有 1 至 6 个碳原子;A、B 和 D 是各自环上的取代基,每个取代基可以不同或相同,可以是氢、卤素、烷基、羟基、烷氧基或其他取代基。