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