You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 3-[(1,1-dioxothiolan-3-yl)methyl]-1-(furan-2-ylmethyl)-1,2-dimethylguanidine by IUPAC nomenclature, provide its molecular formula.
user
C13H21N3O3S
assistant