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/usr/share/gromacs/top/charmm27.ff/rna.n.tdb 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.

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[ None ]

[ 5' ]
[ delete ]
 P
 O1P
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[ replace ]
O5'	O5' 	ON5	15.9994	  -0.66   
C5'	C5'	CN8B	12.011 	   0.05
[ Add ]
 1  2 	H5T	O5'	C5'	C4'
	HN5	1.008	0.43	-1