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The Wittig reaction with protected carboxylic group ( methyl ester ) resulted in side - products whereas using sodium salt resulted in higher yields .
 Chemical: carboxylic; Chemical: methyl ester; Chemical: sodium
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; Chemical: methyl ester; Chemical: sodium