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 1-ethyl-4,6-dimethyl-2-oxo-N-[[(3S)-1-pyrimidin-2-ylpiperidin-3-yl]methyl]pyridine-3-carboxamide ?
user
C20H27N5O2
assistant