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