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