Obeticholic Acid Dimer Impurity

Chemical Name: 3a(3a,7a-dihydroxy-6a-ethyl-5b-cholan-24-oyloxy)7a-hydroxy-6a- ethyl-5b-cholan-24-oic acid ; (4R)-4-((3R,5S,6R,7R,8S,9S,10S,13R,14S,17R)-6-ethyl-3-(((4R)-4-((3S,6S,7S,8S,9S,10S,13R,14S,17R)-6-ethyl-3,7-dihydroxy-10,13-dimethylhexadecahydro-1H-cyclopenta[a]phenanthren-17-yl)pentanoyl)oxy)-7-hydroxy-10,13-dimethylhexadecahydro-1H-cyclopenta[a]phenanthren-17-yl)pentanoic acid