. "The chemical reactions and pathways resulting in the breakdown of purine ribonucleoside triphosphate, a compound consisting of a purine base linked to a ribose sugar esterified with triphosphate on the sugar." . . . . "purine ribonucleoside triphosphate catabolic process" . "purine ribonucleoside triphosphate breakdown" . "purine ribonucleoside triphosphate catabolism" . "purine ribonucleoside triphosphate degradation" . . . . .