You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3S,3'R,8S,9R,9aS)-8-(hydroxymethyl)-3'-methyl-3-[(2S,4S)-4-methyl-5-oxooxolan-2-yl]spiro[1,2,3,5,6,7,8,9a-octahydropyrrolo[1,2-a]azepine-9,5'-oxolane]-2'-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H29NO5
assistant