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