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