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 2-[[2-[[2-[(2-amino-4-methylsulfanylbutanoyl)amino]-3-methylpentanoyl]amino]-3-sulfanylpropanoyl]amino]-3-methylbutanoic acid ?
user
C19H36N4O5S2
assistant