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