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This article reports the pK ( a ) shift of an anti - cancer drug , 20 ( S ) - camptothecin ( CPT ) , upon encapsulation into the nanocavity of a cucurbit [ 7 ] uril ( CB7 ) macrocycle .
 Chemical: 20 ( S ) - camptothecin; Chemical: CPT; Chemical: cucurbit [ 7 ] uril; Chemical: CB7
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: 20 ( S ) - camptothecin; Chemical: CPT; Chemical: cucurbit [ 7 ] uril; Chemical: CB7