20932
New series of [ 1 , 3 , 4 ] thiadiazolo [ 3 , 2 - a ] pyrimidines , benzo [ h ] [ 1 , 3 , 4 ] thiadiazolo [ 2 , 3 - b ] quinazolines , benzothiadiazolotriazocine , and imidazo [ 2 , 1 - b ] [ 1 , 3 , 4 ] thiadiazoles have been synthesized and characterized by analytical and spectrometrical methods ( IR , MS , ( 1 ) H and ( 13 ) C NMR ) .
 Chemical: [ 1 , 3 , 4 ] thiadiazolo [ 3 , 2 - a ] pyrimidines; Chemical: benzo [ h ] [ 1 , 3 , 4 ] thiadiazolo [ 2 , 3 - b ] quinazolines; Chemical: benzothiadiazolotriazocine; Chemical: imidazo [ 2 , 1 - b ] [ 1 , 3 , 4 ] thiadiazoles; 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: [ 1 , 3 , 4 ] thiadiazolo [ 3 , 2 - a ] pyrimidines; Chemical: benzo [ h ] [ 1 , 3 , 4 ] thiadiazolo [ 2 , 3 - b ] quinazolines; Chemical: benzothiadiazolotriazocine; Chemical: imidazo [ 2 , 1 - b ] [ 1 , 3 , 4 ] thiadiazoles; Chemical: ( 1 ) H; Chemical: ( 13 ) C