You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 1-(2,3,4a,5,6,7,8,8a-octahydrobenzo[b][1,4]oxazin-4-yl)-2-[2-(2-methoxyphenyl)piperazin-1-yl]ethanone;hydrochloride ?
user
C21H32ClN3O3
assistant