As a result of these studies: the polarity of C 10 side chain was found to exert greater positive effect on G - than on G + bactria.

• 体外抑菌试验发现随着10位边链的极性增大，对革兰氏阴性（G－）菌的抗菌活性增强，而对革兰氏阳性（G＋）菌活性则变化不大。