C3：丙二酸单酰辅酶 A

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

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\usepackage{chemfig}
\begin{document}
\chemfig{
	(-[5,0.6](-[3,0.6](=[2,0.6]O)(-[5,0.6]HO)))
	(=[2,0.6]O)
	(-[7,0.8]SCoA)
}
\end{document}