2. 脱氢丙氨酸自动分解

[[脱氢丙氨酸]]->[[C3：丙酮酸（pyruvate）]]+{3}$

$化学方程式：$

-

\usepackage{chemfig}
\begin{document}

\chemfig{
	(-[0.7,1]COOH)
	(<[6,0.8]NH_2)
	(=[3.3,1])
}

\begin{tikzpicture} 
\draw [->] (0,0) to node[above] {} (2,0); % 水平箭头 
\end{tikzpicture}

\chemfig{
	(=[5,0.8]O)
	(-[3,0.8]HO)
	(-[,0.5]
		(=[1,0.8]O)
		(-[7,0.8])
	)
} 
+
{3}$

\end{document}