You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(E)-2-[6-(aminomethyl)-8-chloro-5,6-dihydrobenzo[b][1,4]benzoxazepin-7-yl]but-2-enedioic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H15ClN2O5
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