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We determined if modifications of the piperidinyl nitrogen would accommodate a drug - biotin linking strategy for affinity purification of the trisubstituted pyrrole ' s target protein ( s ) .
 Chemical: piperidinyl nitrogen; Chemical: biotin; Chemical: pyrrole
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: piperidinyl nitrogen; Chemical: biotin; Chemical: pyrrole