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