Arylthio compounds

A method of treating retroviral infections comprising administering to a subject in need of treatment an antivirally effective amount of a compound of the formula ##STR12## wherein:

• R.sup.1 and R.sup.11 independently are hydrogen, halo, C.sub.1 -C.sub.6 alkyl, hydroxy, C.sub.1 -C.sub.6 alkoxy, carboxy, C.sub.1 -C.sub.6 alkoxycarbonyl, or NR.sup.2 R.sup.3, where R.sup.2 is hydrogen or C.sub.1 -C.sub.6 alkyl and R.sup.3 is hydrogen, C.sub.1 -C.sub.6 alkyl or C.sub.1 -C.sub.6 alkanoyl;
• R.sup.4 is hydrogen or C.sub.1 -C.sub.6 alkyl;
• Z is C.sub.1 -C.sub.6 alkyl or C.sub.3 -C.sub.6 cycloalkyl, where said alkyl and cycloalkyl groups may have 1 or 2 substituents selected from hydroxy, halo, nitro, NR.sup.2 R.sup.3, carboxy, and C.sub.1 -C.sub.6 alkoxycarbonyl;
• or
• Z is ##STR13## where and as defined above;
• and pharmaceutically acceptable salts and solvates thereof.