/usr/share/gromacs/top/specbond.dat is in gromacs-data 4.6.5-1build1.
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 | 8
CYS SG 1 CYS SG 1 0.2 CYS2 CYS2
CYS SG 1 HEM FE 2 0.25 CYS2 HEME
CYS SG 1 HEM CAB 1 0.18 CYS2 HEME
CYS SG 1 HEM CAC 1 0.18 CYS2 HEME
HIS NE2 1 HEM FE 1 0.2 HIS1 HEME
MET SD 1 HEM FE 1 0.24 MET HEME
CO C 1 HEME FE 1 0.19 CO HEME
CYM SG 1 CYM SG 1 0.2 CYS2 CYS2
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