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NMR data confirmed that the predominant non - polar dimer formed during beta - sitosterol oxidative degradation has a configuration of 3 beta , 3 beta ' - disitosteryl ether .
 Chemical: beta - sitosterol; Chemical: 3 beta , 3 beta ' - disitosteryl ether
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: beta - sitosterol; Chemical: 3 beta , 3 beta ' - disitosteryl ether