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diff --git a/contrib/chem/examples/122/ch4p_cholestanol.chem b/contrib/chem/examples/122/ch4p_cholestanol.chem
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+ch4p_cholestanol.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>.
+
+########################################################################
+
+R1: ring6
+    "R1" at R1     # this puts a label at R1
+    front bond -120 from R1.V5 ; HO
+         # the following line says "fuse the next six-
+         # membered ring with its 6th vertex joining
+         # the second vertex of R1"
+R2: ring6 with .V6 at R1.V2
+    front bond up from R2.V6 ; CH3
+    back bond down from R2.V4 ; H
+    back bond down from R2.V1 ; H
+    front bond up from R2.V2 ; H
+R3: ring6 with .V4 at R2.V2
+R4: flatring with .V5 at R3.V2
+    front bond up from R4.V5 ; CH3
+    back bond down from R4.V4 ; H # this is the alkyl chain
+    bond up from R4.V1 ; BP
+    bond -60 from BP
+    bond 60 from BP
+    bond 120
+    bond 60
+    bond 120 ; BP
+    bond down from BP
+    bond 60 from BP
+
+# Local Variables:
+# mode: Nroff
+# End:
+.cend