15877
A novel 4 - fluoroquinuclidine significantly lowered the pKa of the quinuclidine moiety , reducing efflux as measured by a Caco - 2 assay .
 Chemical: 4 - fluoroquinuclidine; Chemical: quinuclidine
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: 4 - fluoroquinuclidine; Chemical: quinuclidine