Abstract: Antivirally active compounds of the formula ##STR1## wherein A is ##STR2## wherein m is 1 or 2,n is 1 or 2, whereby m is 1 when n is 2 and m is 2 when n is 1,R.sub.a ' is (CH.sub.2).sub.p OH, NHCONH.sub.2 or COR.sub.a ",R.sub.a " is hydrogen, hydroxy or amino,p is 1 to 4,R.sub.b ' and R.sub.b " are independently selected from hydrogen or (CH.sub.2).sub.p OH,with the proviso that at least one of R.sub.b ' or R.sub.b " is hydrogen; orR.sub.b ' and R.sub.b " together constitute an additional carbon-carbon bond to form an alkyne; or a physiologically acceptable salt, geometric or optical isomer thereof; pharmaceutical preparations containing the compounds and methods for treatment of virus infections.