You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl 5-bromo-3-[[2-methyl-3-[3-(2-methylpropoxy)-3-oxopropyl]sulfanylpropyl]amino]-4-oxopentanoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H36BrNO5S
assistant