You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-methoxyethyl 2-amino-4-(3,4-difluorophenyl)-5-oxo-4,6,7,8-tetrahydrochromene-3-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H19F2NO5
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