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