new index atom name original index 1 C 9 2 C 10 3 C 7 4 C 8 5 O 6 6 O 4 7 O 5 8 P 3 9 S 2 10 H 16 11 H 17 12 H 15 13 H 20 14 H 19 15 H 18 16 H 11 17 H 12 18 H 13 19 H 14 20 K 1