You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(Z)-but-2-enedioic acid;1-(2,9-dimethoxy-5,6-dihydrobenzo[b][1]benzothiepin-5-yl)-4-methylpiperazine;hydrate is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H32N2O7S
assistant