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system
Name the molecular formula for the molecule established as (3S,6S,10aS)-6-[(2-fluorobenzoyl)amino]-5-oxo-2,3,6,7,8,9,10,10a-octahydro-1H-pyrrolo[1,2-a]azocine-3-carboxylic acid using the IUPAC nomenclature.
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C18H21FN2O4
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