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 2-[[2-[[2-[(2,4-diamino-4-oxobutanoyl)amino]-3-phenylpropanoyl]amino]-3-sulfanylpropanoyl]amino]-3-sulfanylpropanoic acid .
user
C19H27N5O6S2
assistant