You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-2-[[(2S)-2-[(2S,3S)-2-(dimethylamino)-3-methylpentanoyl]oxy-4-methylpentanoyl]amino]-4-methylpentanoic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H38N2O5
assistant