$coc
7 0 0
1C1 CT 1 0 1 1 0.000000
2H11 H1 0 0 1 1 0.150000
3H12 H1 0 0 1 1 0.150000
4O OS 0 0 1 1 -0.600000
5C2 CT 2 0 1 1 0.000000
6H21 H1 0 0 1 1 0.150000
7H22 H1 0 0 1 1 0.150000
1 4 5
2 1 3
6 5 7