. "\"Interacting selectively and non-covalently with a purine ribonucleoside triphosphate, a compound consisting of a purine base linked to a ribose sugar esterified with triphosphate on the sugar.\" [CHEBI:26398, GOC:BHF, GOC:ebc, ISBN:0198506732]" . . "purine ribonucleoside triphosphate binding" . . . "purine NTP binding" .