An Formal Site of the United States govt. This is how you know we're Formal. dot gov icon Nonabsorbed ursodiol passes into the colon the place it is generally seven-dehydroxylated to lithocholic acid. Some ursodiol is epimerized to chenodiol (CDCA) via a seven-oxo intermediate. Chenodiol also undergoes 7-dehydroxylation to https://www.youtube.com/watch?v=A07qHOeWON8