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 2-[4-(3,4-dihydro-2H-1,5-benzodioxepin-7-ylsulfonyl)piperazin-1-ium-1-yl]-N-[(2R)-3-methylbutan-2-yl]acetamide .
user
C20H32N3O5S+
assistant