You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3S)-3-[[(2S)-2-[[(4S)-4-acetamido-2-(aminomethyl)-5-methylsulfanyl-3-oxopentanoyl]amino]-3-methylbutanoyl]amino]-7-naphthalen-1-yl-4-oxoheptanoic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C31H42N4O7S
assistant