You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (6R)-4-benzyl-10-(2-fluorophenyl)-7-oxa-1,4,11,12-tetrazatricyclo[7.3.0.02,6]dodeca-9,11-diene into its molecular formula.
user
C20H19FN4O
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