腺苷酸基琥珀酸合成酶

[[IMP：肌苷酸，次黄嘌呤核苷酸]]+[[C4：天冬氨酸（Asp，aspartate）]]+[[GTP：三磷酸鸟苷]]->[[腺苷酸基琥珀酸]]+[[GDP：二磷酸鸟苷]]+$

\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](=[2,0.5]O)
	-[4.8,0.3]
}
+
\chemfig{
NH_2
-[4,0.5]C
	(-[4,0.25]H)
	(-[6,0.5]COOH)
	(-[2,0.5]C
		(-[,0.3]H_2)
		(-[2,0.5]COOH)
	)
}
+GTP
\begin{tikzpicture} 
\draw [->] (0,0) to node[above] {} (1,0); 
\end{tikzpicture}

\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]
}
+GDP+$

\end{document}