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 (4'aR,8'aR)-4'a-ethylspiro[1,3-dioxolane-2,7'-3,4,5,6,8,8a-hexahydro-1H-quinoline]-2'-one .
user
C13H21NO3
assistant