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