You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 1-[(3aR,7aS)-1,3,3a,4,5,6,7,7a-octahydroisoindol-2-yl]-2-[5-(methylamino)-1,3,4-thiadiazol-2-yl]ethanone .
user
C13H20N4OS
assistant