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