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This study evaluated microwave - assisted extraction ( MAE ) for four pentacyclic triterpenes as well as developed a method for preparing a pentacyclic triterpenene rich extract from Centella asiatica .
 Chemical: pentacyclic triterpenes; Chemical: pentacyclic triterpenene
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 triterpenes; Chemical: pentacyclic triterpenene