1
\documentclass[12pt]{article}
\usepackage[a4paper, margin=2.5cm]{geometry}
\usepackage{chemfig}

\begin{document}

\begin{center}

{
\chemname
{\chemfig{HO-[:30]-[:-30]-[:30]OH}}
{Diol}\\
\bigskip
\bigskip
$+$\\
\chemname
{\chemfig{([3]N=C=O)-[0]*6(=-=([0]-*6(=-=(-[0]([9]N=C=O))-=-))-=-)}}
{Isocyanates}\\
\bigskip
\bigskip
$\downarrow$\\
\bigskip
\bigskip
\chemname
{\chemfig{-O(=[2]C)-N(-[6]H)-(*6(=-=(-*6(=-=(-N(-[6]H)-O(=[2]C)-O-O-)-=-))-            
=-))}}
{Polyurethane}
}

\end{center}



\end{document}

How can I put parentheses around the "Polyurethane" structure so that the parentheses intersect the two outer bond?

Much thanks!

  • Tags latex3 and pdftex are not for general LaTeX. – user156344 Mar 29 at 5:59
5

With \polymerdelim (introduced in version 1.33 of chemfig):

\documentclass[12pt]{article}
\usepackage[a4paper, margin=2.5cm]{geometry}
\usepackage{chemfig}

\begin{document}

\begin{center}
\chemname
{\chemfig{-[@{upleft,0.5},1]O(=[2]C)-N(-[6]H)-(*6(=-=(-*6(=-=(-N(-[6]H)-O(=[2]C)-O-O-[@{upright,0.5},1])-=-))-            
=-))}}
{Polyurethane}
\polymerdelim[delimiters ={[]}, height = 45pt, depth = 40pt, indice = n]{upleft}{upright}
\end{center}

\end{document}

enter image description here

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