You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (2R,3S,4R,5R)-2-(hydroxymethyl)-5-[6-(methylamino)-1-[(3-methylphenyl)methoxy]purin-1-ium-9-yl]oxolane-3,4-diol .
user
C19H24N5O5+
assistant