17395
Synthesis of new derivatives of pyrido [ 2 , 3 - d ] [ 1 , 2 , 4 ] triazolo [ 4 , 3 - a ] pyrimidin - 5 - one via reaction of 7 - ( 4 - bromophenyl ) - 1 , 2 - dihydro - 5 - ( 4 - fluorophenyl ) - 2 - thioxopyrido [ 2 , 3 - d ] pyrimidin - 4 ( 3H ) - one with hydrazonoyl chlorides or reaction of 2 - hydrazino - pyrido [ 2 , 3 - d ] pyrimidin - 4 ( 3H ) - one with different aldehydes followed by cyclization of the products .
 Chemical: pyrido [ 2 , 3 - d ] [ 1 , 2 , 4 ] triazolo [ 4 , 3 - a ] pyrimidin - 5 - one; Chemical: 7 - ( 4 - bromophenyl ) - 1 , 2 - dihydro - 5 - ( 4 - fluorophenyl ) - 2 - thioxopyrido [ 2 , 3 - d ] pyrimidin - 4 ( 3H ) - one; Chemical: hydrazonoyl chlorides; Chemical: 2 - hydrazino - pyrido [ 2 , 3 - d ] pyrimidin - 4 ( 3H ) - one; Chemical: aldehydes
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 - one; Chemical: 7 - ( 4 - bromophenyl ) - 1 , 2 - dihydro - 5 - ( 4 - fluorophenyl ) - 2 - thioxopyrido [ 2 , 3 - d ] pyrimidin - 4 ( 3H ) - one; Chemical: hydrazonoyl chlorides; Chemical: 2 - hydrazino - pyrido [ 2 , 3 - d ] pyrimidin - 4 ( 3H ) - one; Chemical: aldehydes