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diff --git a/contrib/chem/examples/cholesterin.chem b/contrib/chem/examples/cholesterin.chem
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+cholesterin.chem:
+.cstart
+
+# Example file for 'chem':
+# Cholesterin or C27_H46O or
+# 10,13-dimethyl-17-(6-methylheptan-2-yl)-2,3,4,5,6,9,11,12,14,15,16,17-
+# dodecahydro-1H-cyclopenta[a]phenanthren-3-ol
+
+# Copyright (C) 2006-2020 Free Software Foundation, Inc.
+# Written by Bernd Warken <groff-bernd.warken-72@web.de>.
+
+# 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/>.
+
+R1: ring6
+ bond -120 ; HO
+R2: ring6 with .V5 at R1.V3 with .V6 at R1.V2 double 4,5
+ bond up at R2.V6
+R3: ring6 with .V5 at R2.V1 with .V4 at R2.V2
+R4: flatring5 pointing up with .V4 at R3.V3 with .V5 at R3.V2
+ bond up at R4.V5
+ bond up at R4.V1
+B1: bond -60
+ bond 60 at B1.start
+ bond 120
+ bond 60
+ bond 120
+B2: bond 60
+ bond down at B2.start
+
+# Local Variables:
+# fill-column: 72
+# mode: Nroff
+# End:
+# vim: set textwidth=72:
+.cend