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Diclofenac sodium ( Voltarol , Geigy Pharmaceuticals ) is a non - steroidal anti - inflammatory derivative of phenylacetic acid .
 Diclofenac sodium, Voltarol, phenylacetic acid
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Diclofenac sodium, Voltarol, phenylacetic acid