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