1. INTRODUCTION

2. METHODS
2.1. Data reduction

3. OBSERVATIONAL RESULTS
3.1. Molecule detections
3.2. Population diagrams
3.3. Disk-averaged abundance ratios

4. ABUNDANCE PROFILE MODELING
4.1. V4046 Sgr model
4.2. MWC 480 model
4.3. CH3CN and HC3N column densities and abundances

5. DISCUSSION
5.1. Nitrile formation in disks
5.2. Physical drivers of nitrile chemistry in disks

6. CONCLUSIONS