NCIt definition : An orally bioavailable, non-nucleoside, 3,4-dihydroquinazolinyl acetic acid and inhibitor
of the pUL56 subunit of the viral terminase complex of cytomegalovirus (CMV), with
potential CMV-specific antiviral activity. Upon oral administration, letermovir binds
to the pUL56 subunit of the viral terminase complex of CMV and prevents the cleavage
of concatemeric DNA into monomeric genome length DNA. As this agent interferes with
viral DNA processing and subsequent viral DNA packaging into procapsids, CMV replication
is blocked and CMV infection is prevented.;