如何让 LaTeX chemnum 包与 .png 图像一起工作？

Question

我一直在尝试（已经尝试了太长时间）让 LaTeX 自动标记 overleaf 文档中的化合物，并能够使用 \insertgraphics 命令添加 .png 图像。

我尝试从已经具有自动编号的模板开始，其中 chemdraws 在 .eps 文件中预先填充了 TMP1、TMP2 等（https://www.overleaf.com/latex/templates/automatically-numbering-compounds-in-chemical-schemes/kybckmsxnshs）。

不幸的是，我无法使用 .png 文件添加图形，因为我开始收到有关“无法确定 file.png 中图形的大小（没有 BoundingBox）”的错误消息。未定义的控制序列。

有人知道我可以用什么方法在下面的代码中添加图片吗？实际上，添加任何图像都可以。

如果您点击链接，即可获得 hexa.eps 文件。

    \documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage{graphicx}

\title{Automatically numbering compounds in chemical schemes}


%% Uncomment these lines if you get error about "too many \new..." 
% \let\tmp\newinsert
% \let\newinsert\newbox
\usepackage{chemstyle}
% \let\newinsert\tmp
\usepackage{chemnum}

% For positioning the scheme captions at the top.
\floatsetup[scheme]{position=top}

\begin{document}

\begin{scheme}
%% hexa.eps has "TMP1" and "TMP2" as the markers
%% in fact EVERY .eps should start with TMP1, TMP2 etc
%% for ease of use
\replacecmpd{first:compound}  %% automatically replace TMP1
\replacecmpd{second:compound}  %% automatically replace TMP2
\includegraphics[width=\linewidth]{hexa}
\caption{This is something!}
\label{first:chem:scheme}
\end{scheme}

Compounds \refcmpd{first:compound} and \refcmpd{second:compound} in \ref{first:chem:scheme}. Here's a reference to in-text creation of \cmpd{RareCompound} that we can later refer to.

\vfill

\begin{scheme}
\replacecmpd{next:compound} %% automatically replace TMP1 BUT the autonumbering counter updates to 3!
\replacecmpd{last:compound} %% automatically replace TMP2
\includegraphics[width=\linewidth]{hexa}
\caption{This is something else!}
\label{second:chem:scheme}
\end{scheme}

Compounds \refcmpd{next:compound} and \refcmpd{last:compound} in \ref{second:chem:scheme}. Hey remember \cmpd{RareCompound}? \texttt{chemnum} still remembers it correctly, \emph{and} see how the compound numbering continues throughout the scheme diagrams!

\vfill

%% MANUAL UPDATING THE COMPOUND COUNTER; make sure you know what you're doing!
\setcounter{cmpdmain}{8} 

\begin{scheme}
\replacecmpd{jumped:compound} %% automatically replace TMP1 BUT the autonumbering counter updates to 9!
\replacecmpd{nextjumped:compound} %% automatically replace TMP2
\includegraphics[width=\linewidth]{hexa}
\caption{This is again something else!}
\label{third:chem:scheme}
\end{scheme}

Compounds \refcmpd{jumped:compound} and \refcmpd{nextjumped:compound} in \ref{third:chem:scheme}. (Yes we manually modified the compound numbering counter after \ref{second:chem:scheme}).



\end{document}