/usr/share/gromacs/top/oplsaa.ff/ethanol.itp 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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; Ethanol, Jorgensen et al. JACS 118 pp. 11225 (1996)
;
[ moleculetype ]
; name nrexcl
ETH 3
[ atoms ]
; nr type resnr residu atom cgnr charge mass
1 opls_157 1 ETH C 1 -0.18
2 opls_156 1 ETH H 1 0.06
3 opls_156 1 ETH H 1 0.06
4 opls_156 1 ETH H 1 0.06
5 opls_157 1 ETH C 2 0.145
6 opls_156 1 ETH H 2 0.06
7 opls_156 1 ETH H 2 0.06
8 opls_154 1 ETH OA 2 -0.683
9 opls_155 1 ETH HO 2 0.418
[ bonds ]
; ai aj funct c0 c1
1 5 1
3 1 1
4 1 1
2 1 1
7 5 1
6 5 1
8 5 1
9 8 1
[ pairs ]
; i j func
2 6
2 7
2 8
3 6
3 7
3 8
4 6
4 7
4 8
1 9
6 9
7 9
[ angles ]
; ai aj ak funct c0 c1
; H3
2 1 5 1
3 1 5 1
4 1 5 1
;
4 1 3 1
4 1 2 1
;
3 1 2 1
;
1 5 7 1
1 5 6 1
1 5 8 1
;
5 8 9 1
;
6 5 7 1
6 5 8 1
;
7 5 8 1
;
[ dihedrals ]
2 1 5 6 3
3 1 5 6 3
4 1 5 6 3
2 1 5 7 3
3 1 5 7 3
4 1 5 7 3
2 1 5 8 3
3 1 5 8 3
4 1 5 8 3
1 5 8 9 3
6 5 8 9 3
7 5 8 9 3
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