You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-2-[(1S,9R)-6-oxo-7,11-diazatricyclo[7.3.1.02,7]trideca-2,4-dien-11-yl]-2-(2-phenyl-1H-indol-3-yl)acetic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C27H25N3O3
assistant