14337
In this study trisubstituted pyrrole derivatives with different substituents on a piperidinyl nitrogen were prepared .
 Chemical: pyrrole; Chemical: piperidinyl nitrogen
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: pyrrole; Chemical: piperidinyl nitrogen