You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R,3S,4R,5R)-2-(hydroxymethyl)-5-[6-imino-5-(2-methylpropylsulfanyl)purin-9-yl]oxolane-3,4-diol The above is the IUPAC name of a molecule. Write its molecular formula.
user
C14H21N5O4S
assistant