You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3R,3'R,4'S,5'R)-5-bromo-5'-(2-hydroxyethyl)-4'-[(4-methoxyphenyl)-dimethylsilyl]-3'-methyl-1-[[4-(6-oxo-3-phenyl-4,5-dihydropyridazin-1-yl)phenyl]methyl]spiro[indole-3,2'-oxolane]-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C40H42BrN3O5Si
assistant