キ

\documentclass[b5j,9pt]{tetsujsarticle}
\usepackage{tetsuchem}
\pagestyle{empty}

\begin{document}
\baselineskip21.6pt \large

\配列区切り文字の変更{//}
  \余白設定[
    上余白=.8truecm,
    下余白=1truecm,
    左余白=2truecm,
    左右差=.3truecm,
    段間隔=20truept,
    段組の仕切り線の太さ=.5truept,
    ヘッダの縦幅=10truept,
    ヘッダ下端と本文上端の縦間隔=10truept+.2truecm,
    ヘッダと本文を仕切る線の太さ=0truept,
    本文下端とフッタ下端の縦間隔=0truept,
    本文とフッタを仕切る線の太さ=0truept,
    傍注領域の幅=0truept,
    本文端と傍注領域との間隔=0truept,
    傍注同士の縦間隔=\baselineskip,
    奇数ページの傍注位置=右,
    偶数ページの傍注位置=左,
  ]%


\begin{center}
\nousece
\setatomsep{3em}
\setbondoffset{2pt}
\setcrambond{2pt}{}{}
\chemfig{OH-[2,.5]?[a](-[2,.5]H)<[7,.7](-[2,.35]OH)(-[6,.5]H)-[,,,,line width=2.6pt](-[2,.5]H)(-[6,.5]OH)>[1,.7](-[2,.5]H)
 (-[7,.5]O-[1,.5]?[b](-[2,.5]H)<[7,.7](-[2,.35]OH)(-[6,.5]H)-[,,,,line width=2.6pt](-[2,.5]H)(-[6,.5]OH)>[1,.7](-[2,.5]H)(-[6,.5]OH)-[3,.7]O-[4]?[b](-[6,.35]H)(-[2,.5,,2]H_2C
  (-[:10,1.5]O-[2,1.4]?[c](-[2,.5]H)<[5,.7](-[2,.5]H)(-[6,.5]OH)-[4,,,,line width=2.6pt](-[2,.35]OH)(-[6,.5]H)>[3,.7](-[2,.5]H)(-[6,.5]OH)-[1,.7](-[6,.35]H)(-[2,.5]CH_2 -[,.6]OH)-O?[c]
  )
 )
 )
-[3,.7]O-[4]?[a](-[6,.35]H)(-[2,.5]CH_2-[,0.6]OH)}

\br{0.25}
\bf{A}\hamidasi(6zw,13zw){\bf{C}}\ihspace{8zw}\bf{B}\ihspace{0.8zw}
\end{center}

\end{document}