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