8903
In the absence of surfactant ( i . e . , in the butanol / benzene system ) , 1D C ( 60 ) nanowhiskers ( nanorods ) and C ( 60 ) nanotubes ( diameter 400 nm - 2 mu m and length 5 - 20 mu m ) are obtained .
 Chemical: butanol; Chemical: benzene; Chemical: C ( 60 ); Chemical: C ( 60 )
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: butanol; Chemical: benzene; Chemical: C ( 60 ); Chemical: C ( 60 )