You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3aS,6aS)-N-[4-(2-hydroxycyclohexyl)oxyphenyl]-2,3,4,5,6,6a-hexahydro-1H-cyclopenta[c]pyrrole-3a-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H28N2O3
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