You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl (2S)-2-[[(2S,3R)-3-hydroxy-2-(phenylmethoxycarbonylamino)butanoyl]amino]-4-methylpent-4-enoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H26N2O6
assistant