15109
Between 25 and 500 ms , minor populations of protonated imine are detected that have previously been postulated to precede enamine intermediates .
 Chemical: imine; Chemical: enamine
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: imine; Chemical: enamine