请教：使用`chemfig`宏包酚醛树脂的缩聚反应方程式如何写

\documentclass{article}
\usepackage{chemfig}
\usepackage{mhchem}
\usepackage{xcolor}
\begin{document}

\[
        \setchemfig{atom sep=2em}
        \hreac
            $n$\chemfig{*6(=-=(-[0]CH_2OH)-(-[2]OH)=-)}
            >[{\ce{H+}}][{$\triangle$}]
            \chemfig{H-[@{op,.75}]([:30]*6(=-=(-CH_2-[@{cl,0.25}])-=-))-OH}\polymerdelim[delimiters ={[]}, height = 5pt, indice = n]{op}{cl}
            + $(n - 1)$\ce{H2O}
            %\polymerdelim[delimiters ={[]}, height = 5pt, indice = \!\!n]{op}{cl}
        \endhreac
\]
\end{document}

代码如上，请帮忙看下如何调整，谢过了先

又调整了下，目前的问题：1）第一个n不居中，2）最右-OH前面的线不水平，代码如下，如何修改？请赐教

\documentclass{article}
\usepackage{chemfig}
\usepackage{mhchem}
\usepackage{xcolor}
\begin{document}

\[
        \setchemfig{atom sep=2em}
        \hreac
            \chemfig{*6(=-=(-[0]CH_2OH)-(-[2]OH)=-)}
            >[{\ce{H+}}][{$\triangle$}]
            \chemfig{H-[@{op,.75}]([:-30]*6(-=-=(-[0]CH_2-[@{cl,.25}]-[0]OH)-(-[2]OH)=))}\polymerdelim[delimiters ={[]}, height = 5pt, indice = n]{op}{cl}
            + $(n - 1)$\ce{H2O}
            %\polymerdelim[delimiters ={[]}, height = 5pt, indice = \!\!n]{op}{cl}
        \endhreac
\]
\end{document}