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 (3aR,6aS)-5-butan-2-yl-7'-chloro-1-(1-hydroxyethyl)spiro[1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3,3'-1H-indole]-2',4,6-trione .
user
C19H22ClN3O4
assistant