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