I need to draw the following scheme of equilibrium state of Fluorescein
[![enter image description here](https://i.stack.imgur.com/yqoD3.png)](https://i.stack.imgur.com/yqoD3.png)

Using `chemfig` package, and here's my code for that:

```
\documentclass[12pt, a4paper]{article}
\usepackage{chemfig}
\begin{document}
\chemfig{
    O=[:-54]*5(-O-(-*6(-(*6(-=-(-OH)=-=))--O-(*6(=-(-OH)=-=-))--))-(*6(-=-=-=))--)
}
\end{document}

```

The only problem I have is I can't get rid of the bond shown in the result of the previous code, any idea?

[![enter image description here](https://i.stack.imgur.com/egczK.png)](https://i.stack.imgur.com/egczK.png)