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