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