You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[3-[[(2R)-3-(1,3-benzodioxol-5-ylmethoxy)-2-hydroxypropyl]azaniumyl]-2,2-dimethylpropyl]-dimethylazanium is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H32N2O4+2
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