26228
Recognizing the functionality of the pentacyclic steroidal derivative 7a as important synthon to obtain new brassinosteroid analogs , we have accomplished the derivatization of hecogenin , a sapogenin from the 25R serie containing a carbonyl group at C - 12 , to a 22 , 23 - dioxocholestanic chain derivative .
 Chemical: pentacyclic steroidal; Chemical: brassinosteroid; Chemical: hecogenin; Chemical: carbonyl; Chemical: 22 , 23 - dioxocholestanic
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: pentacyclic steroidal; Chemical: brassinosteroid; Chemical: hecogenin; Chemical: carbonyl; Chemical: 22 , 23 - dioxocholestanic