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