26446
The secondary KIE ( kH / kD = 1 . 26 +/- 0 . 04 ) measured for deacylation at C - 2 / 3 suggests a mechanism involving a ketene intermediate for those positions .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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