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