4H-pyrazolo[1 ,5-a]pyrazolo[4',3':5,6]pyrido[3,4-e]pyrimidin-5(8H)one and derivatives thereof

A compound of the formula ##STR8## wherein R.sup.1 is hydrogen, lower alkyl, phenyl, phenyl-lower alkylene, benzoyl or substituted benzoyl;

• R.sup.2, r.sup.4 and R.sup.6 each is hydrogen or lower alkyl;
• R.sup.3 is hydrogen, lower alkyl or phenyl;
• R.sup.5 is hydrogen, lower alkyl, phenyl-lower alkylene, benzoyl, substituted benzoyl, lower alkanoyl, lower alkoxy-lower alkylene, lower alkylthio-lower alkylene, phenyl or substituted phenyl;
• the substituent on said substituted benzoyl or substituted phenyl being halogen, lower alkyl or lower alkoxy, and physiologically acceptable acid addition salts thereof.