You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[[(2R,4S,5R)-5-(2-amino-7-methyl-6-oxo-1H-purin-9-ium-9-yl)-3,4-dihydroxyoxolan-2-yl]methoxy-oxidophosphoryl]oxy-[2-[4-[2-[[[(2R,4S,5R)-5-(2-amino-6-oxo-1H-purin-9-yl)-3,4-dihydroxyoxolan-2-yl]methoxy-oxidophosphoryl]oxy-oxidophosphoryl]ethyl]triazol-1-yl]ethylamino]phosphinate is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H37N14O20P4-3
assistant