The present invention relates to a compounds according to formula I, methods for treating diseases mediated by human immunodeficiency virus by administration of a compound according to formula I and pharmaceutical compositions for treating diseases mediated by human immunodeficiency virus containing a compound according to formula I where R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, are as defined herein. ##STR00001##