You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[[1-(6-ethylpyrimidin-4-yl)piperidin-3-yl]carbamoyl]-3-methylpyrrolidine-3-carboxylic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H27N5O3
assistant