You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3aS,4S,7S,7aS)-4,7-diethoxy-2,2-dimethyl-3a,4,7,7a-tetrahydro-1,3-benzodioxole is the IUPAC name of a molecule. Please give its molecular formula.
user
C13H22O4
assistant