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