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