You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]-5,6-dimethyl-1H-benzimidazole-2-thione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C14H18N2O4S
assistant