You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (2S)-2-amino-5-[[(2R)-1-(carboxymethylamino)-3-[[3-(dimethylcarbamoyl)-4-nitrophenyl]disulfanyl]-1-oxopropan-2-yl]amino]-5-oxopentanoic acid ?
user
C19H25N5O9S2
assistant