9781
A small series of thiazolidine - 2 , 4 - dione and barbituric acid derivatives 1 - 4 was prepared using a short synthetic route , and all compounds were characterized by elemental analysis , mass spectrometry , and NMR ( ( 1 ) H , ( 13 ) C ) spectroscopy .
 Chemical: thiazolidine - 2 , 4 - dione; Chemical: barbituric acid; Chemical: ( 1 ) H; Chemical: ( 13 ) C
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: thiazolidine - 2 , 4 - dione; Chemical: barbituric acid; Chemical: ( 1 ) H; Chemical: ( 13 ) C