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