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