You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3aS,6aR)-2-[[4-(1-hydroxyethyl)phenyl]methylcarbamoyl]-1,3,4,5,6,6a-hexahydrocyclopenta[c]pyrrole-3a-carboxylic acid is the IUPAC name of a molecule. Please give its molecular formula.
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C18H24N2O4
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