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The antinociception caused by the ethanol extract ( 30mg / kg ) in the abdominal constriction test was significantly attenuated ( P < 0 . 001 ) by intraperitoneal treatment of mice with l - arginine ( 600mg / kg ) .
 Chemical: ethanol; Chemical: l - arginine
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: ethanol; Chemical: l - arginine