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Substituent effects of a series of N1 protio and methyl naphthyridinone HIV - 1 integrase strand - transfer inhibitors has been explored .
 Chemical: methyl naphthyridinone
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: methyl naphthyridinone