17811
In the initial route , tertiary amide cleavage during final step was challenging , but cleaving the tertiary amide before Wittig reaction was beneficial .
 Chemical: tertiary amide; Chemical: tertiary amide
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: tertiary amide; Chemical: tertiary amide