You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance (2R)-1-[(2S,6S)-2,6-dimethylpiperidin-1-yl]-2-(4-pyrimidin-2-ylpiperazin-1-ium-1-yl)propan-1-one .
user
C18H30N5O+
assistant