ursodeoxycholic acid ( 0.5 % ) and its analog ursodeoxy-oxazoline [ 2- ( 3 alpha , 7 beta-dihydroxy-24-nor-5 beta-cholanyl ) -4,4-dimethyl-2- oxazoline ] were ineffective in preventing gallstones .
C0042105
ursodeoxycholic acid
C0008350
gallstones