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