1. Introduction  
2. Targets — APM 08279+5255 and NCv.1.143  
3. Observations and Data Reduction  
4. Data Analysis  
5. Continuum: Thermal Dust and Free-Free Emission  
6. A Detailed Look at the Detected Molecules and a Comparison of the Two Sources  
7. Chemical Analysis of the Dense Molecular Gas  
8. Impact of the Lensing on the Analysis  
9. Conclusions  