如何美化这个 chemfig 图形？

Question

我想创建两个二肽缩合物的图形氨基酸：

我在看 chemfig手动的并提出了以下解决方案：

\documentclass{article}
\usepackage{chemfig}
\usepackage{tikz}
\begin{document}
\scalebox{1}{
    \begin{tikzpicture}
    \setchemfig{atom sep=2.2em}
    \setchemfig{arrow offset=3pt,arrow coeff=0.7} 
    \schemestart
        \chemname{\chemfig{N(-[:120]H)(-[:-120]H)-C(-[:90]H)(-[:-90]\color{orange}{R_1})-\color{red}{C}(=[:60]\color{red}{O})(-[:-60]\color{blue}{OH})}}{Amino acid 1}
        \+
        \chemname{\chemfig{\color{red}{N}(-[:120]\color{red}{H})(-[:-120]\color{blue}{H})-C(-[:90]H)(-[:-90]\color{violet}{R_2})-C(=[:60]O)(-[:-60]OH)}}{Amino acid 2}
        \arrow(.mid east--.mid west)
        \chemname{\chemfig{N(-[:120]H)(-[:-120]H)-[:30]C(-[:90]H)(-[:-90]\color{orange}{R_1})-[:-30]\color{red}{C}(=[:-90]\color{red}{O})-[:+30]\color{red}{N}(-[:90]\color{red}{H})-[:-30]C(-[:90]H)(-[:-90]\color{violet}{R_2})-[:+30]C(=[:60]O)(-[:-60]OH)}}{Dipeptide}
        \+
        \chemname{\chemfig{\color{blue}{H_2O}}}{Water}
        \schemestop
    \chemnameinit{}
    \end{tikzpicture}
}
\end{document}

我怎样才能使其更具吸引力并更好地对齐元素和标签？