22011
Optimized SLNs were incorporated into Carbopol gel and evaluated for drug content , pH , in vitro release , ex vivo retention , in vivo pharmacodynamic and stability studies .
 Chemical: Carbopol
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Carbopol