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