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