23949
Novel 6 - substituted - 4 - cycloalkyloxy - pyridin - 2 ( 1H ) - ones were synthesized as non - nucleoside reverse transcriptase inhibitors ( NNRTIs ) , and their biological activity was evaluated .
 Chemical: 6 - substituted - 4 - cycloalkyloxy - pyridin - 2 ( 1H ) - ones; Chemical: nucleoside
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: 6 - substituted - 4 - cycloalkyloxy - pyridin - 2 ( 1H ) - ones; Chemical: nucleoside