new index	atom name	original index
1	C	1
2	C	8
3	C	7
4	C	4
5	C	3
6	C	5
7	C	2
8	C	6
9	O	9
10	H	10
11	H	12
12	H	11
13	H	21
14	H	22
15	H	23
16	H	18
17	H	19
18	H	20
19	H	14
20	H	15
21	H	13
22	H	16
23	H	17
