You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (6R,6aR,11bR)-6-(4-ethoxyphenyl)-2-nitro-6,6a,7,11b-tetrahydro-5H-indeno[2,1-c]quinoline into its molecular formula.
user
C24H22N2O3
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