You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (1S,8aS)-6-(2-methoxy-4-nitroanilino)-5,8a-dimethyl-2,3,4,6,7,8-hexahydro-1H-naphthalen-1-ol .
user
C19H26N2O4
assistant