You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl-[3-[2-chloro-4-[(E)-2-[(2R,3R,8S)-2,3-diphenyl-1,4-dioxaspiro[4.4]nonan-8-yl]-1-(5-ethyl-6-methoxypyridin-2-yl)ethenyl]phenyl]sulfanylpropoxy]-dimethylsilane is the IUPAC name of a molecule. Please give its molecular formula.
user
C44H54ClNO4SSi
assistant