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