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