You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(6S)-6-(3,4-dihydro-1H-isoquinoline-2-carbonyl)-4-[2-(4-hydroxyphenyl)ethyl]piperazin-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H25N3O3
assistant