1296
Density functional theory study on the reaction mechanism of synthesizing 1 , 3 - dimethyl - 2 - imidazolidinone by urea method .
 Chemical: 1 , 3 - dimethyl - 2 - imidazolidinone; Chemical: urea
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: 1 , 3 - dimethyl - 2 - imidazolidinone; Chemical: urea