You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(7-bromo-1,1-dioxo-5-phenyl-3,4-dihydro-2H-1lambda6,5-benzothiazepin-8-yl)oxy]acetic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C17H16BrNO5S
assistant