You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S,3S,4S,5S)-2-[6-amino-8-[2-[(2-chlorophenyl)methylidene]hydrazinyl]purin-9-yl]-5-(hydroxymethyl)oxolane-3,4-diol The above is the IUPAC name of a molecule. Write its molecular formula.
user
C17H18ClN7O4
assistant