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