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diff --git a/contrib/chem/examples/122/ch4w_lsd.chem b/contrib/chem/examples/122/ch4w_lsd.chem
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+ch4w_lsd.chem:
+.br
+.cstart
+
+# Example file for 'chem':
+
+# This originates from Computing Science Technical Report No. 122
+#   CHEM - A Program for Typesetting Chemical Diagrams: User Manual
+#   by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
+#   <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
+
+# Copyright (C) 2006-2020 Free Software Foundation, Inc.
+
+# This file is part of 'chem', which is part of 'groff'.
+
+# 'groff' is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License (GPL) version 2 as
+# published by the Free Software Foundation.
+
+# 'groff' is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# The GPL2 license text is available in the internet at
+# <http://www.gnu.org/licenses/gpl-2.0.html>.
+
+########################################################################
+
+B: benzene pointing right
+F: flatring pointing left put N at 5 double 3,4 with .V1 at B.V2
+   H below F.N
+R: ring pointing right with .V4 at B.V6
+   front bond right from R.V6 ; H
+W: ring pointing right with .V2 at R.V6 put N at 1 double 3,4
+   bond right from W.N ; CH3
+   back bond -60 from W.V5 ; H
+   bond up from W.V5 ; C
+   double bond up from C ; O
+   bond right from C ; N
+   bond 45 from N ; C2H5
+   bond 135 from N ; C2H5
+
+# Local Variables:
+# mode: Nroff
+# End:
+.cend