Substituent in the YThere are small red, but a great piece of blue region, indicating to replace the positively charged group of anti-bacterial activity of compoundsMore sensitive to raise.

• 在Y取代基处有很小块红色部分，但有很大块的蓝色区域，这说明取代正电性的基团对化合物抗菌活性的提高更敏感。