You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named (1R,2S)-2-(aminomethyl)-N-spiro[3,4-dihydrochromene-2,1'-cyclopentane]-4-ylcyclopentane-1-carboxamide is given. What is its corresponding molecular formula?
user
C20H28N2O2
assistant