You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 11-methyl-8-(4-methylpiperidine-1-carbonyl)-6-pyridin-3-yl-6,7-dihydropyrido[2,1-d][1,5]benzothiazepin-9-one is given. What is its corresponding molecular formula?
user
C26H27N3O2S
assistant