This question follows one I posted earlier this week (here).
I'm having trouble using chemnum, for replacement of temporary labels (TMP1, TMP2, TMP3) in a scheme made with chemdraw. It indeed affects the labels, as they disappear, but they are not replaced at all.
Here is the code I use:
\documentclass[a4paper,12pt,notitlepage]{book}
%Packages
\RequirePackage{etex}
\usepackage[utf8]{inputenc}
\usepackage[francais]{babel}
\usepackage[T1]{fontenc}
\usepackage{graphicx}
\usepackage[crop=off]{auto-pst-pdf}
\usepackage{psfrag}
%chemistry packages
\usepackage{chemstyle}
\usepackage{chemnum}
\usepackage{chemscheme}
\usepackage{titling}
\usepackage{titlesec} %to correct spacing of chapters
\titleformat{\chapter}[display]
{\normalfont\huge\bfseries}{\chaptertitlename\ \thechapter}{20pt}{\Huge}
\titlespacing*{\chapter}{0pt}{-50pt}{20pt}
\titleformat{\chapter}[hang]
{\normalfont\huge\bfseries}{\chaptertitlename\ \thechapter:}{1em}{}
%Title
\title{Partie expérimentale}
\author{Me}
\begin{document}
\chapter{Partie Expérimentale}
\section{Synthèse du thiéno[3,2-b]thiophène-2,5-diylbis((3-bromothiophèn-2-yl)méthanol)}
\cmpd*{a}
\cmpd*{b}
\cmpd*{c}
\begin{scheme}[ht]
\replacecmpd{a}
\replacecmpd{b}
\replacecmpd{c}
\includegraphics[scale=0.7]{Schema_Synthese_3.eps}
\caption{Schéma réactionnel 1}
\end{scheme}
\end{document}
And here is the .eps file if needed.
Any piece of advice on how to get the labels I want?

Iperather than use\psfrag. With Ipe you can change, quickly, the labels. See at the link http://tex.stackexchange.com/questions/354244/tracing-with-xfig-to-make-shapepar-command/354332#354332 my answer. – Sebastiano Feb 17 '17 at 15:01\psfragright in TeXnic Center ? – Allan Feb 17 '17 at 15:08\psfrag, almost 13 years. For example with, Ipe, InkScape, Adobe Illustator, you can edit easily your labels of your file .eps. You can see too this link http://tex.stackexchange.com/questions/311912/psfrag-does-not-change-the-text or others. – Sebastiano Feb 17 '17 at 15:14chemnumusespsfragfor. (Loadingpsfragin addition tochemnumis superfluous…) – cgnieder Feb 20 '17 at 12:08chemnum. That's all I wanted to know… – cgnieder Feb 21 '17 at 12:50chemnumbutpsfrag. In these days I am very busy to seechemnumpackage. I would not know what to answer you. I simply wrote that there are other ways to put labels in LateX. – Sebastiano Feb 21 '17 at 13:08