You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 19-(9-pyridin-2-yl-1,10-phenanthrolin-2-yl)-3,11-dithia-19-azapentacyclo[10.7.0.02,10.04,9.013,18]nonadeca-1(12),2(10),4,6,8,13,15,17-octaene by IUPAC nomenclature, provide its molecular formula.
user
C33H18N4S2
assistant