You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 3-[9-[3-(3-methylimidazole-1,3-diium-1-yl)benzene-2-id-1-yl]fluoren-9-yl]-9-pyridin-2-yl-2H-carbazol-2-ide;platinum(2+) .
user
C40H26N4Pt+2
assistant