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