You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(9R)-9-(3,4-dimethoxyphenyl)-13-(4-fluorophenyl)-2-oxa-12,14,15,17-tetrazatetracyclo[8.7.0.03,8.011,15]heptadeca-1(10),3(8),4,6,11,13,16-heptaen-5-ol is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H19FN4O4
assistant