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