哪个 Tex 命令可以绘制与线重叠的括号？

Question

请向我展示一个 Latex 中的命令，它可以绘制这样的括号

Answer 1

\documentclass{article}
\usepackage{chemfig}
\begin{document}
    \chemfig{-[@{op,.75}]CH2-CH(-[-90]cl)-[@{cl,0.25}]}
    \polymerdelim[height = 5pt, depth = 25pt, open xshift = -10pt, indice = \!\!n]{op}{cl}
    
\end{document}

编辑使粘合线变粗并着色

\documentclass{article}
\usepackage{chemfig}
\begin{document}
    \chemfig[
            bond style={line width= 1pt ,blue}
            ] 
            {-[@{op,.75},0.75]CH_2-CH(-[-90,0.75]Cl)-[@{cl,0.25},0.75]}
    \polymerdelim[height = 5pt, depth = 25pt, open xshift = -10pt, indice = \!\!n]{op}{cl}
    
\end{document}

编辑2-- 为了让分隔符 mov 更接近原子，删除了 openxshift=10pt