Optionally substituted 4,5,7,8-tetrahydro-(optionally 4-thioxo or 4-imino)-(lHor 2H)-imidazo[l,2-a]pyrazolo[4,3-e]pyrimidine or 4,5,7,8,9-pentahydro-(optionally 4-thioxo or 4-imino)-(1Hor 2H)-pyrimido[l,2-a]pyrazolo[4,3-e]pyrimidine compoundsor Compounds of Formula I. processes for their production, their use as p