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Starting from hecogenin acetate ( 5a ) or hecogenin tosylate ( 5b ) , we obtained two pentacyclic derivatives ( 7a and 7b ) which were subjected to an oxidation reaction on the double bond at C - 12 ( 23 ) to obtain a 22 , 23 - dioxocholestanic chain , with the regeneration of the carbonyl group at C - 12 .
 Chemical: hecogenin acetate; Chemical: hecogenin tosylate; Chemical: 22 , 23 - dioxocholestanic; Chemical: carbonyl
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: hecogenin acetate; Chemical: hecogenin tosylate; Chemical: 22 , 23 - dioxocholestanic; Chemical: carbonyl