Cn：β-酮脂酰CoA（β-ketoacyl-CoA）

$结构式：$

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\usepackage{chemfig}
\begin{document}
\chemfig{
	\fbox{R}-[7,0.8]-[1,0.6](=[2,0.5]O)-[7,0.6]-[1,0.6]
	(-[7,0.8]SCoA)
	(=[2,0.5]O)
}
\end{document}

-

\usepackage{chemfig}
\begin{document}
\chemfig{
	\fbox{R}-[,0.8]CH_2-[,0.6]C(=[2,0.5]O)-[,0.6]CH_2-[,0.6]C
	(-[,0.8]SCoA)
	(=[2,0.5]O)
}
\end{document}