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