the 7- and 12-monosulfates of chenodeoxycholic acid , deoxycholic acid , and cholic acid were prepared by sulfation of the protected bile acids with sulfur trioxide-triethylamine in pyridine overnight and were isolated by precipitation as the p-toluidinium salt after removing the protecting group ( s ) .
C0008024
chenodeoxycholic acid
C0011479
deoxycholic acid