23717
A series of 3 - substituted 1 , 5 - diarylpyrroles bearing a nitrooxyalkyl side chain linked to different spacers were designed .
 Chemical: 3 - substituted 1 , 5 - diarylpyrroles; Chemical: nitrooxyalkyl
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: 3 - substituted 1 , 5 - diarylpyrroles, nitrooxyalkyl 
Answer:
 Chemical: 3 - substituted 1 , 5 - diarylpyrroles; Chemical: nitrooxyalkyl