You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 9-chloro-3-[(2-methyl-1,3-thiazol-5-yl)methyl]-5H-benzo[b][1,4]benzothiazepin-6-one;formaldehyde;methanamine is given. What is its corresponding molecular formula?
user
C20H20ClN3O2S2
assistant