new index atom name original index 1 C 9 2 C 10 3 C 7 4 C 3 5 C 5 6 C 2 7 C 8 8 C 11 9 C 6 10 C 4 11 O 1 12 H 23 13 H 22 14 H 24 15 H 26 16 H 27 17 H 25 18 H 19 19 H 18 20 H 20 21 H 15 22 H 16 23 H 17 24 H 13 25 H 14 26 H 21 27 H 28 28 H 29 29 H 12