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A new pentacyclic triterpenoid and three new derivatives based on the taraxer - 14 - ene skeleton with a C - 28 attached a carboxylic acid group have been isolated from the stem bark of Hypodaphnis zenkeri , together with six known compounds .
 Chemical: pentacyclic triterpenoid; Chemical: taraxer - 14 - ene; Chemical: carboxylic 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: pentacyclic triterpenoid; Chemical: taraxer - 14 - ene; Chemical: carboxylic acid