the addition of glycine- and taurine-conjugated primary bile acids ( chenodeoxycholic and cholic acids ) and other bile acids to binary cultures of b. fragilis and g20-7 revealed that ( i ) both conjugates were hydrolyzed to give free bile acids , ( ii ) ursocholic acid ( 3 alpha , 7 beta , 12 alpha-trihydroxy-5 beta-cholanoic acid ) was produced when conjugated ( or free ) cholic acid was the substrate , and ( iii ) the epimerization reaction was at least partially reversible .
C0008404
cholic acids
C0055568
cholic acid