You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule [(1R,5S,9aR)-5-methyl-2,3,4,6,7,8,9,9a-octahydro-1H-quinolizin-5-ium-1-yl]methanol into molecular formula.
user
C11H22NO+
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