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We further demonstrated that the Staudinger ligation between azides and phosphines proceeds under acidic conditions with only a small loss of efficiency .
 Chemical: azides; Chemical: phosphines
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: azides, phosphines 
Answer:
 Chemical: azides; Chemical: phosphines