You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance (2S)-2-[(3aR,7aS)-1,3-dioxo-3a,4,7,7a-tetrahydroisoindol-2-yl]-N-(6,7-dihydro-[1,4]dioxino[2,3-f][1,3]benzothiazol-2-yl)propanamide .
user
C20H19N3O5S
assistant