腺苷酸基琥珀酸裂解酶

[[腺苷酸基琥珀酸]]->[[AMP：单磷酸腺苷，腺嘌呤核糖核苷酸，腺苷酸]]+[[C4：延胡索酸（富马酸，fumaric）]]

\usepackage{chemfig}
\begin{document}

\chemfig{
N(-[4,0.3]H)
	-[6,0.5]
	=[7.3,0.5]N
	-[0.8,0.5]
	=[2,0.5]
		(
			-[0.5,0.5]N
			=[6.55,0.5]
			-[5.25,0.5]N(-[6,0.8]\fbox{R})
			-[3.5,0.4]
		)
	-[3.3,0.5]
	(-[2,0.4]NH
		-[2,0.5]CH
			(-[,0.5]CH_2-[,0.6]COOH)
			(-[4,0.5]HOOC)
	)
	-[4.8,0.3]
}

\begin{tikzpicture} 
\draw [->] (0,0) to node[above] {} (1,0); 
\end{tikzpicture}

\chemfig{
N
-[6,0.5]
=[7.3,0.5]N
-[0.8,0.5]
=[2,0.5]
	(
		-[0.5,0.5]N
		=[6.55,0.5]
		-[5.25,0.5]N(-[6,0.8]\fbox{R})
		-[3.5,0.4]
	)
-[3.3,0.5](-[2,0.5]NH_2)
=[4.8,0.3]
}
+
\chemfig{
	CH
		(=[2,0.5]CH-[,0.5]COOH)
		(-[,0.5]COOH)
}

\end{document}