You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3aS,4S,6R,6aR)-6-ethyl-2,2-dimethyl-4-(2-phenylethynyl)-3a,4,6,6a-tetrahydrofuro[3,4-d][1,3]dioxole The above is the IUPAC name of a molecule. Write its molecular formula.
user
C17H20O3
assistant