You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-N-butyl-2-[(3-methoxyphenyl)methyl-[3-(4-methylphenyl)sulfanylpropanoyl]amino]butanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H36N2O3S
assistant