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