You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (4R)-4-(4-cyclopentyloxy-3-methoxyphenyl)-3-methyl-4,8-dihydro-2H-pyrazolo[3,4-e][1,4]thiazepin-7-one by IUPAC nomenclature, provide its molecular formula.
user
C19H23N3O3S
assistant