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