You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [(3R,3aS,4S,4aR,5R,9aR)-4-hydroxy-4a,5-dimethyl-2-oxo-3,3a,4,5,6,7,9,9a-octahydrobenzo[f][1]benzofuran-3-yl]methyl-(3-methoxypropyl)azanium by IUPAC nomenclature, provide its molecular formula.
user
C19H32NO4+
assistant