/usr/share/gromacs/top/gmx.ff/aminoacids.c.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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[ COO- ]
[ replace ]
C C C 12.011 0.27
O O1 OM 15.9994 -0.635
OXT O2 OM 15.9994 -0.635
[ add ]
2 8 O C CA N
OM 15.9994 -0.635
[ impropers ]
C O1 O2 CA
[ COOH ]
[ replace ]
C C C 12.011 0.53
O O OA 15.9994 -0.548
OXT OT O 15.9994 -0.38
[ add ]
1 2 OT C CA N
O 15.9994 -0.38
1 2 HO O C CA
HO 1.008 0.398
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