11031
The statistically optimized formulation ( PTSso ) was characterized by Fourier transform infrared spectroscopy and differential scanning calorimetry studies , and no significant chemical interaction between drug and polymer was observed .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None