new index atom name original index 1 C 3 2 C 4 3 C 10 4 C 8 5 C 9 6 C 5 7 C 6 8 C 1 9 C 7 10 C 2 11 H 14 12 H 12 13 H 13 14 H 17 15 H 16 16 H 15 17 H 24 18 H 22 19 H 23 20 H 20 21 H 21 22 H 18 23 H 19 24 H 11