You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [(4aS,8aR)-3,4,4a,5,6,7,8,8a-octahydro-2H-quinolin-1-yl]-[3-[(2-methyl-1,3-thiazol-4-yl)methoxy]phenyl]methanone by IUPAC nomenclature, provide its molecular formula.
user
C21H26N2O2S
assistant