You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 9,10-dimethoxy-3-(2-methylpropyl)-2,3,4,6,7,7a,8,9,10,11,11a,11b-dodecahydro-1H-benzo[a]quinolizin-2-ol into molecular formula.
user
C19H35NO3
assistant