You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N'-[2-(1,1-dihydroxy-3,5-dihydro-2H-1lambda4,4-benzothiazepin-4-yl)-6-methylquinolin-4-yl]octane-1,8-diamine by IUPAC nomenclature, provide its molecular formula.
user
C27H38N4O2S
assistant