You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule 7-phenyl-3-(piperidin-4-ylmethyl)-6,7,8,9-tetrahydro-5H-[1,2,4]triazolo[4,3-a]azepine;hydrochloride ?
user
C19H27ClN4
assistant