You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name [3-[5-[1-methyl-1-(2-pyrrolidin-1-ylethyl)pyrazol-1-ium-4-yl]pyrimidin-2-yl]phenyl]methanamine into its molecular formula.
user
C21H27N6+
assistant