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