new index	atom name	original index
1	C	1
2	C	2
3	C	6
4	C	3
5	C	7
6	C	4
7	C	8
8	C	5
9	C	9
10	C	10
11	N	11
12	N	12
13	H	13
14	H	14
15	H	15
16	H	16
17	H	20
18	H	21
19	H	17
20	H	22
21	H	23
22	H	18
23	H	24
24	H	25
25	H	19
26	H	26