457
Its derivatives , 2 alpha , 3 alpha - diacetyltaraxer - 14 - en - 28 - oic acid ( 2 ) , 2 alpha , 3 alpha - di - O - carbonyl - 2 alpha , 3 alpha - dihydroxytaraxer - 14 - en - 28 - oic acid ( 3 ) and 2 alpha , 3 alpha - dipropionyltaraxer - 14 - en - 28 - oic acid ( 4 ) were obtained by semisynthesis .
 Chemical: 2 alpha , 3 alpha - diacetyltaraxer - 14 - en - 28 - oic acid; Chemical: 2 alpha , 3 alpha - di - O - carbonyl - 2 alpha , 3 alpha - dihydroxytaraxer - 14 - en - 28 - oic acid; Chemical: 2 alpha , 3 alpha - dipropionyltaraxer - 14 - en - 28 - oic acid
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: 2 alpha , 3 alpha - diacetyltaraxer - 14 - en - 28 - oic acid; Chemical: 2 alpha , 3 alpha - di - O - carbonyl - 2 alpha , 3 alpha - dihydroxytaraxer - 14 - en - 28 - oic acid; Chemical: 2 alpha , 3 alpha - dipropionyltaraxer - 14 - en - 28 - oic acid