You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
28-thiaheptacyclo[15.11.0.03,15.04,13.05,10.018,27.020,25]octacosa-1(17),2,4(13),5,7,9,11,15,18,20,22,24,26-tridecaene The above is the IUPAC name of a molecule. Write its molecular formula.
user
C27H16S
assistant