8601
Two additional countermeasures were required : reprotection of the diol as the carbonate ester " 45 " with triphosgene and removal of the benzoate group ( KCN ) to alcohol " 46 " in preparation of the actual ring closure to the oxetane " 47 " with N , N-diisopropylethylamine .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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