5 # Example file for `chem':
7 # This originates from Computing Science Technical Report No. 122
8 # CHEM - A Program for Typesetting Chemical Diagrams: User Manual
9 # by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
10 # <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
12 # Copyright (C) 2006-2014 Free Software Foundation, Inc.
14 # This file is part of `chem', which is part of `groff'.
16 # `groff' is free software; you can redistribute it and/or modify it
17 # under the terms of the GNU General Public License (GPL) version 2 as
18 # published by the Free Software Foundation.
20 # `groff' is distributed in the hope that it will be useful, but
21 # WITHOUT ANY WARRANTY; without even the implied warranty of
22 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23 # General Public License for more details.
25 # You should have received a copy of the GNU General Public License
26 # along with this program. If not, see <http://www.gnu.org/licenses/>.
28 # The GPL2 license text is available in the internet at
29 # <http://www.gnu.org/licenses/gpl-2.0.html>.
31 ########################################################################
34 bond 120 length .3 ; BP
35 back bond -120 length .25 from BP ; H
36 front bond 120 length .25 from BP ; CH3
37 bond 60 length .5 from BP ; BP
38 bond -60 length .25 from BP ; H
39 # note the pic move command to position the text
40 move left .35 ; "(ANTI)"
41 front bond 60 length .25 from BP ; H
42 # another positioning of text
43 move right .35 ; "(SYN)"
44 bond 120 length .4 from BP ; BP
45 back bond -120 length .25 from BP ; H
46 front bond 120 length .25 from BP ; CH3
47 bond 60 length .5 from BP
50 ########################################################################