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 methyl-[2-[[(4R)-4-methyl-2,5-dioxo-4-(2-phenylethyl)imidazolidin-1-yl]amino]-2-oxoethyl]-[2-oxo-2-(propan-2-ylamino)ethyl]azanium ?
user
C20H30N5O4+
assistant