You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 6-(2-methyl-3-nitrobenzoyl)imino-2-oxo-7-[[(2S)-oxolan-2-yl]methyl]-1,7,9-triazatricyclo[8.4.0.03,8]tetradeca-3(8),4,9,11,13-pentaene-5-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C27H25N5O7
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