You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule [(3aS,4R,5R,6S,7S,7aR)-6,7-dihydroxy-5-methyl-2,3,3a,4,5,6,7,7a-octahydro-1H-isoindol-4-yl]-[4-(pyridin-3-ylmethoxy)piperidin-1-yl]methanone ?
user
C21H31N3O4
assistant