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