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In this context , the discovery and development of novel carboxylic acid surrogates that could complement the existing palette of isosteres remains an important area of research .
 Chemical: carboxylic acid
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: carboxylic acid