22805
The structures were determined by combined chemical and spectral methods , and the absolute configurations of compounds 2 , 3 , 5 - 7 , 9 , 14 , and 17 were determined by the modified Mosher ' s method and CD analysis .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None