3,7-Dihydro- and 1,7-dihydro-4H-pyrazolo[4',3':5,6]pyrido[4,3-d]pyrimidin-4-ones

A compound of the formula ##STR36## wherein R.sup.1 is hydrogen, lower alkyl or phenyl;

• R.sup.2, r.sup.4 and R.sup.5 each is hydrogen or lower alkyl;
• and
• R.sup.3 is hydrogen, lower alkyl, phenyl, substituted phenyl wherein the phenyl substituent is one or two halo, lower alkyl or lower alkoxy groups, phenyl-lower alkyl or di(lower alkyl)amino-lower alkyl.