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