You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[[2-[(2-amino-4-methylsulfanylbutanoyl)amino]-3-hydroxybutanoyl]amino]-5-[[1-carboxy-4-(diaminomethylideneamino)butyl]amino]-5-oxopentanoic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H37N7O8S
assistant