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Name the molecular formula for the molecule established as methyl 4-[[(5R)-4-methoxy-6-methyl-5,6,7,8-tetrahydro-[1,3]dioxolo[4,5-g]isoquinolin-6-ium-5-yl]amino]benzoate using the IUPAC nomenclature.
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C20H23N2O5+
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