An official Web site of The usa govt. Here's how you realize we're official. dot gov icon Nonabsorbed ursodiol passes in to the colon in which it is usually 7-dehydroxylated to lithocholic acid. Some ursodiol is epimerized to chenodiol (CDCA) through a 7-oxo intermediate. Chenodiol also undergoes 7-dehydroxylation to https://www.youtube.com/watch?v=A07qHOeWON8