You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-2-[[(Z)-2-(furan-2-carbonylamino)-3-(furan-2-yl)prop-2-enoyl]amino]-4-methylpentanoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H19N2O6-
assistant