9952
Our results suggest that 1 , 8 - naphthalimide derivatives with electron - donating - OCH3 and - N ( CH3 ) 2 ( 1 and 2 ) , electron - withdrawing - CN and - COCH3 ( 3 and 4 ) , 2 - ( thiophen - 2 - yl ) thiophene ( 5 ) , 2 , 3 - dihydrothieno [ 3 , 4 - b ] [ 1 , 4 ] dioxine ( 6 ) , 2 - phenyl - 1 , 3 , 4 - oxadiazole ( 7 ) , and benzo [ c ] [ 1 , 2 , 5 ] thiadiazole ( 8 ) fragments are expected to be promising candidates for luminescent materials for OLEDs , particularly for 5 and 7 .
 Chemical: 1 , 8 - naphthalimide; Chemical: - OCH3; Chemical: - N ( CH3 ) 2; Chemical: - CN; Chemical: - COCH3; Chemical: 2 - ( thiophen - 2 - yl ) thiophene; Chemical: 2 , 3 - dihydrothieno [ 3 , 4 - b ] [ 1 , 4 ] dioxine; Chemical: 2 - phenyl - 1 , 3 , 4 - oxadiazole; Chemical: benzo [ c ] [ 1 , 2 , 5 ] thiadiazole
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 , 8 - naphthalimide; Chemical: - OCH3; Chemical: - N ( CH3 ) 2; Chemical: - CN; Chemical: - COCH3; Chemical: 2 - ( thiophen - 2 - yl ) thiophene; Chemical: 2 , 3 - dihydrothieno [ 3 , 4 - b ] [ 1 , 4 ] dioxine; Chemical: 2 - phenyl - 1 , 3 , 4 - oxadiazole; Chemical: benzo [ c ] [ 1 , 2 , 5 ] thiadiazole