You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 2-[[2-[(4R,4aR,7S,7aR,12bS)-7,9-dihydroxy-3-methyl-2,4,4a,7,7a,13-hexahydro-1H-4,12-methanobenzofuro[3,2-e]isoquinolin-3-ium-3-yl]acetyl]amino]acetic acid into molecular formula.
user
C21H25N2O6+
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