You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4aR,6S,7R,8S,8aR)-8-ethenyl-6-methoxy-7-methyl-2-phenyl-4a,6,7,8a-tetrahydro-4H-pyrano[3,2-d][1,3]dioxin-8-ol is the IUPAC name of a molecule. Please give its molecular formula.
user
C17H22O5
assistant