You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
8,14-diselena-1,3-diazapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaene is the IUPAC name of a molecule. Please give its molecular formula.
user
C17H10N2Se2
assistant