Compounds and compositions are provided which are useful for the treatment of viral infections, particularly human Cytomegalovirus infection. The cap has a top surface and a bottom surface. A height adjustment member 14 is engageable with the thread 18 to be rotatable to a required height. Each of the clutches and the brake are located within specific areas defined by the planetary gear sets and the housing walls. By removing at least a portion of the tear strip, the starter orifice becomes accessible to facilitate the separation of the dual carton into separate individual cartons.