You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3aR,5S,6S,6aR)-5-ethyl-6-methoxy-2,2-dimethyl-5-propan-2-yl-6,6a-dihydro-3aH-furo[2,3-d][1,3]dioxole;[(2S,3R,4S,5S)-5-ethyl-4-methoxy-2-methyl-5-propan-2-yloxolan-3-yl] acetate;[(2S,3S,4S,5S)-5-ethyl-4-methoxy-2-methyl-5-propan-2-yloxolan-3-yl] acetate;methane;(2S,3R,4S)-4-methoxy-2-methyl-5,5-di(propan-2-yl)oxolan-3-ol is the IUPAC name of a molecule. Please give its molecular formula.
user
C78H148O23
assistant