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