You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl N-[1-[[2-(butylamino)-1-(3-ethenylphenyl)-2-oxoethyl]-methylamino]-4-methylsulfanyl-1-oxobutan-2-yl]carbamate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C25H39N3O4S
assistant