ch6b_dna.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, 2009 Free Software Foundation, Inc.

# Last update: 5 Jan 2009

# 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 as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# `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/>.

########################################################################

P: [
R1:  flatring pointing up put N at 1 put N at 4 double 5,1
     bond -135 from R1.V4 ; BP
     "deoxyribose" rjust with .e at BP.w
R2:  ring6 put N at 2 put N at 4 double 1,2 3,4 5,6 with .V6 at R1.V2
     pic Conn: R2.V2.ne #because naming is too restricted in pic
     bond up from R2.V1 ; N
     bond -60 from N ; H
     bond 60 from N ; H
]
     # thymine
Q: [
R3:  ring6 put N at 3 put N at 5 double 1,2
     bond up from R3.V1 ; CH3
     bond 120 from R3.V3 ; BP
     "deoxyribose" ljust with .w at BP.e
     double bond down from R3.V4 ; O
     double bond -60 from R3.V6 ; O
     bond -120 from R3.V5 ; H
] with .O at P.H + (.3,.3)
     bond from Q.O.sw to P.H.ne dotted
     bond from Q.H.sw to P.Conn dotted

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.cend