You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named methyl 6-chloro-5-[(2R,5S)-5-ethyl-2-methyl-4-(1-methylpiperidin-4-yl)piperazin-1-yl]pyrazine-2-carboxylate is given. What is its corresponding molecular formula?
user
C19H30ClN5O2
assistant