You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-[[2-[[2-[(2-amino-3-sulfanylpropanoyl)amino]-4-methylpentanoyl]amino]-5-(diaminomethylideneamino)pentanoyl]amino]-3-methylpentanoic acid into its molecular formula.
user
C21H41N7O5S
assistant