#+TITLE: Possible bug in the LaTeX exporter
#+AUTHOR: Laurent Steffan
#+OPTIONS: tex:t toc:nil

\begin{equation*}\label{eq:dummy}
  A_{\B_C} 
\end{equation*}

\begin{equation*}
\label{eq:dummy}
  A_{\B_C} 
\end{equation*}

\begin{equation*}
  A_{\B_C} 
\end{equation*}