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