You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-(2,2-dimethyl-1,3-dioxolan-4-yl)-2-ethyl-2-methyl-3a,5,6,6a-tetrahydrofuro[2,3-d][1,3]dioxol-6-ol The above is the IUPAC name of a molecule. Write its molecular formula.
user
C13H22O6
assistant