You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (2S)-2-amino-5-[[(2R)-1-(carboxymethylamino)-3-[4-(methylamino)benzoyl]sulfanyl-1-oxopropan-2-yl]amino]-5-oxopentanoic acid .
user
C18H24N4O7S
assistant