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A simple GC - MS method for the simultaneous determination of betulinic , corosolic , maslinic , oleanolic and ursolic acids was developed and applied to 38 different commercial plant extracts sold as ingredients for dietary supplements .
 Chemical: betulinic , corosolic , maslinic , oleanolic and ursolic acids
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: betulinic , corosolic , maslinic , oleanolic and ursolic acids