26789
A butterfly - shaped pyrene derivative of cholesterol , namely , N , N ' - ( ethane - 1 , 2 - diyl ) - bis ( N - ( 2 - ( chol - amino ) ethyl ) pyrene - 1 - sulfonamide ) ( ECPS ) , has been designed and synthesized .
 Chemical: cholesterol; Chemical: N , N ' - ( ethane - 1 , 2 - diyl ) - bis ( N - ( 2 - ( chol - amino ) ethyl ) pyrene - 1 - sulfonamide ); Chemical: ECPS
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: cholesterol; Chemical: N , N ' - ( ethane - 1 , 2 - diyl ) - bis ( N - ( 2 - ( chol - amino ) ethyl ) pyrene - 1 - sulfonamide ); Chemical: ECPS