17810
The failure of ortho - metalation using unprotected carboxylic acid group compelled us to use directed ortho - metalation in which a tertiary amide was used as a strong ortho - directing group .
 Chemical: carboxylic acid; Chemical: tertiary amide
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: carboxylic acid, tertiary amide 
Answer:
 Chemical: carboxylic acid; Chemical: tertiary amide