You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(9R)-5-methyl-3-oxo-4-phenyl-9-thiophen-3-yl-8,17-dioxa-4-azatetracyclo[7.7.1.02,7.011,16]heptadeca-2(7),5,11(16),12,14-pentaene-13-carbonitrile is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H18N2O3S
assistant