You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4aR,7R,7aS)-6-methoxy-2,2-dimethyl-7-phenylmethoxy-4a,6,7,7a-tetrahydro-4H-furo[3,2-d][1,3]dioxine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H22O5
assistant