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