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+chAa_polymer.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>.
+
+########################################################################
+
+# epoxy based on the m-phenyldiamine cured bisphenol-A
+ size 8
+ bond dotted
+ bond ; N
+ bond ; CH2
+ bond down from N
+R1: benzene
+ bond 120 length .1 from R1.V3 ; N
+ bond right length .1 from N
+ bond down length .1 from N
+# back to the CH2
+ bond right from CH2 ; CH
+ bond down from CH ; OH
+ bond right from CH ; CH2
+ bond right ; O
+ bond right
+ benzene pointing right
+ bond right ; C
+ bond up from C ; CH3
+ bond down from C ; CH3
+ bond right from C
+ benzene pointing right
+ bond right ; O
+ bond right from O ; CH2
+ bond right ; CH
+ bond down from CH ; OH
+ bond right from CH ; CH2
+ bond right ; N
+ bond right from N
+ bond dotted
+ bond down from N
+R2: benzene
+ bond 120 length .1 from R2.V3 ; N
+ bond right length .1 from N
+ bond down length .1 from N
+
+# Local Variables:
+# mode: Nroff
+# End:
+.cend