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+ch4y_reserpine.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>.
+# Some corrections were added.
+
+# 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>.
+
+########################################################################
+
+    CH3O
+    bond 60
+R1: benzene
+R2: aromatic flatring5 pointing down put N at 1 with .V3 at R1.V2
+    H below R2.V1
+R3: ring put N at 3 with .V5 at R2.V5
+R4: ring put N at 1 with .V1 at R3.V3
+    back bond -120 from R4.V4 ; H
+    back bond 60 from R4.V3 ; H
+R5: ring with .V1 at R4.V3
+    bond -120 ; C
+    double bond down from C ; O
+    CH3O left of C
+    back bond 60 from R5.V3 ; H
+    back bond down from R5.V4 ; O
+    CH3 right of O
+    bond 120 from R5.V3 ; O
+    bond right length .1 from O ; C
+    double bond down ; O
+    bond right length .1 from C
+B:  benzene pointing right
+    bond 30 from B.V6 ; OCH3
+    bond right from B.V1 ; OCH3
+    bond 150 from B.V2 ; OCH3
+
+# Local Variables:
+# mode: Nroff
+# End:
+.cend