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Furthermore , sinapic acid reduced hepatic hydroxyproline content , which correlated with a reduction in the expression of type I collagen mRNA and histological analysis of collagen in liver tissue .
 sinapic acid, hydroxyproline
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 sinapic acid, hydroxyproline