You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name N-[(3R)-5-methyl-4-oxo-2,3-dihydro-1,5-benzothiazepin-3-yl]-3-phenoxybenzamide ?
user
C23H20N2O3S
assistant