You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 5-[(3aS,4R,9bR)-8-methyl-2,3,3a,4,5,9b-hexahydro-1H-cyclopenta[c]quinolin-4-yl]-6-methylpyridine-2-carboxylic acid ?
user
C20H22N2O2
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