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