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Phenylmethyl 6-Ethylidene-3,7-dihydroxy-Cholan-24-oic Acid Ester-d5 is an intermediate used in the synthesis of 6-Ethylchenodeoxycholic-d5 Acid (E899812), which is an isotope labelled compound of 6-Ethylchenodeoxycholic Acid (E899810), which is used in the investigative treatment of primary biliary cholangitis. Primary biliary cholangitis is an autoimmune disease of the liver that slowly progresses to cirrhosis.