16099
Features of this work include cyclization reactions without pyrophosphate activation , and stereospecific ring closure of substrates of varying chain length and terminal nucleophile .
 Chemical: pyrophosphate
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: pyrophosphate