21393
1 - Methylimidazolium hydrogen sulfate catalyzed convenient synthesis of 2 , 5 - dimethyl - N - substituted pyrroles under ultrasonic irradiation .
 Chemical: 1 - Methylimidazolium hydrogen sulfate; Chemical: 2 , 5 - dimethyl - N - substituted pyrroles
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: 1 - Methylimidazolium hydrogen sulfate; Chemical: 2 , 5 - dimethyl - N - substituted pyrroles