new index atom name original index 1 C 9 2 C 12 3 C 13 4 C 14 5 C 3 6 C 1 7 C 8 8 C 2 9 C 4 10 N 11 11 O 10 12 O 5 13 O 6 14 O 7 15 H 20 16 H 21 17 H 22 18 H 23 19 H 24 20 H 25 21 H 28 22 H 26 23 H 27 24 H 31 25 H 30 26 H 29 27 H 18 28 H 19 29 H 15 30 H 16 31 H 17