You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as 3,4,4a,5,6,7,8,8a-octahydro-2H-quinolin-1-yl-[1-methyl-5-(4-methylphenyl)pyrazol-4-yl]methanone using the IUPAC nomenclature.
user
C21H27N3O
assistant