You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[4-[(R)-(3-hydroxyphenyl)-[(2S)-2,4,4-trimethylpiperazin-4-ium-1-yl]methyl]phenyl]-pyrrolidin-1-ylmethanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H34N3O2+
assistant