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Synthesis of pyrido [ 2 , 3 - d ] [ 1 , 2 , 4 ] triazolo [ 4 , 3 - a ] pyrimidin - 5 - ones as potential antimicrobial agents .
 Chemical: pyrido [ 2 , 3 - d ] [ 1 , 2 , 4 ] triazolo [ 4 , 3 - a ] pyrimidin - 5 - ones
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: pyrido [ 2 , 3 - d ] [ 1 , 2 , 4 ] triazolo [ 4 , 3 - a ] pyrimidin - 5 - ones