/usr/share/gromacs/top/charmm27.ff/dna.arn is in gromacs-data 4.5.5-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | DNA C7 C5M
DNA H71 H51
DNA H72 H52
DNA H73 H53
DNA OP1 O1P
DNA OP2 O2P
DNA H2' H2'1
DNA H2'' H2'2
DNA H5' H5'1
DNA H5'' H5'2
DNA HO5' H5T
DNA HO3' H3T
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