1 Introduction

2 Analysis
2.1 Rotation Diagram
2.2 Column Density

3 Results
3.1 Optical Depth
3.2 Rotation Temperature and Column Density
3.3 Column Density Ratios

4 Discussion
4.1 Trend of Molecular Abundances Surrounding the AGN
4.2 Possible Scenario for the Differentiation of Molecular Abundances

5 Conclusions