new index	atom name	original index
1	C	12
2	C	11
3	C	10
4	C	9
5	C	8
6	C	5
7	C	2
8	C	7
9	C	6
10	C	3
11	C	1
12	O	4
13	H	20
14	H	19
15	H	18
16	H	17
17	H	16
18	H	14
19	H	13
20	H	15
