You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 4-(2,3,3a,4,5,6,7,7a-octahydroindol-1-yl)-6-chloropyrimidine-5-carbaldehyde is given. What is its corresponding molecular formula?
user
C13H16ClN3O
assistant