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