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 (6E)-6-(2,2-dimethylpropylidene)-10b-(4-methoxyphenyl)-2,3-dimethyl-1,4-dihydroselenopyrano[2,1-a][2]benzoselenol-5-ium .
user
C26H31OSe+
assistant