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 identified by 5-(2-methyl-1-phenylbenzimidazol-5-yl)-3-(1-methylpiperazin-2-yl)-1,2,4-oxadiazole;hydrochloride ?
user
C21H23ClN6O
assistant