new index	atom name	original index
1	C	12
2	C	11
3	C	10
4	C	9
5	C	8
6	C	7
7	C	6
8	C	5
9	C	4
10	C	3
11	O	2
12	O	1
13	H	20
14	H	19
15	H	18
16	H	17
17	H	16
18	H	15
19	H	14
20	H	13
21	H	22
22	H	21