1. INTRODUCTION  
2. OBSERVATIONS  
3. MOLECULE DETECTION  
3.1. Data and Tools  
3.2. Results  
4. SPECTRAL ENERGY DISTRIBUTION (SED) MODELING  
4.1. Data  
4.2. Tools and Methods  
4.3. Results  
4.4. Warm Region Sizes in the YSO Models  
5. DISCUSSION  
5.1. SED and Classification of Hot Corino  
5.2. Detection Rate of Hot Corinos  
5.3. Complex Organic Molecules in Protostellar Cores  
6. CONCLUSION