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