You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule 2-[[7-[(2-hydroxy-3-methoxyphenyl)methylideneamino]-5,5-dioxodibenzothiophen-3-yl]iminomethyl]-6-methoxyphenol ?
user
C28H22N2O6S
assistant