Maribavir -d6 TFA (1263W94-d6 TFA; BW1263W94-d6 TFA; GW257406X-d6 TFA) is a deuterium labeled Maribavir. Maribavir is an orally active antiviral agent for cytomegalovirus ( CMV ) through inhibition of protein kinase UL97 and the following CMV DNA replication.