You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 6-[2-[2-(4-hydroxyphenyl)ethyl]piperidine-1-carbonyl]-1H-[1,2,4]triazolo[1,5-a]pyrimidin-7-one .
user
C19H21N5O3
assistant