You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
platinum(2+);2-[3-[(9-pyridin-2-yl-1,9-dihydrofluoren-1-id-2-yl)oxy]benzene-2-id-1-yl]-1,3-benzoselenazole The above is the IUPAC name of a molecule. Write its molecular formula.
user
C31H18N2OPtSe
assistant