You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(5R)-5-(3-methoxyphenyl)-5-methyl-3-[2-oxo-2-[(3R)-3-phenyl-2,3-dihydro-1,4-benzothiazin-4-yl]ethyl]imidazolidine-2,4-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H25N3O4S
assistant