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Bioisosterism of alpha - amino acids is often accomplished by replacing the alpha - carboxylate with one of the many known carboxylic acid bioisosteres .
 Chemical: alpha - amino acids; Chemical: alpha - carboxylate; 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: alpha - amino acids; Chemical: alpha - carboxylate; Chemical: carboxylic acid