| 51 | Epoxide |
[C;r3][O;r3][C;r3] |
 |
77 |
56 |
3 |
7 |
125 |
| 52 | Ester |
[#6][CX3](=[O])-[O]-[#6] |
 |
12 |
13 |
2 |
3 |
16 |
| 53 | Furan |
[#8]1:[#6]:[#6]:[#6]:[#6]1 |
 |
1 |
1 |
1 |
1 |
1 |
| 54 | Gamma-Lactam |
[O-0X1]=[C]1[C][C][C][N]1 |
 |
3 |
1 |
1 |
1 |
7 |
| 55 | Gamma-Lactone |
O=[#6]-1-[#6]-[#6]-[#6]-[#8]-1 |
 |
12 |
5 |
1 |
2 |
12 |
| 56 | Haloisocyanide |
[#6][N+]#[C][F,Cl,I,Br] |
 |
1 |
1 |
1 |
1 |
1 |
| 57 | Halomethyl Amidine |
[*]-[N]-[C](=[N])-[CX4]-[F,Cl,Br,I] |
 |
4 |
3 |
1 |
1 |
4 |
| 58 | Halomethyl Carbonyl |
[*][CX3](=[O])[CX4]-[F,Cl,Br,I] |
 |
112 |
57 |
5 |
8 |
145 |
| 59 | Hemiacetal |
[OX2H][CX4][OX2][#6] |
 |
30 |
57 |
3 |
8 |
79 |
| 60 | Hydrazide |
[*][CX3](=[O])[#7]~[#7] |
 |
9 |
5 |
3 |
2 |
9 |
| 61 | Imidazolidinone |
[O]=[C]1[N][C][C][N]1 |
 |
11 |
25 |
1 |
1 |
53 |
| 62 | Imidoyl Halide |
[F,Cl,Br,I][#6]=[N] |
 |
2 |
5 |
1 |
2 |
5 |
| 63 | Isoselenazolinone |
[O]=[#6]1[#6][#6][Se][#7]1 |
 |
4 |
3 |
1 |
1 |
6 |
| 64 | Isothiazolinone |
[O]=[#6]1[#6][#6][#16][#7]1 |
 |
5 |
5 |
1 |
1 |
5 |
| 65 | Isothiocyanate |
[#6][N]=[C]=[S] |
 |
6 |
2 |
1 |
2 |
6 |
| 66 | Isoxazolidin-3-one |
[#8]=[#6]1-[#6]-[#6]-[#8]-[#7]-1 |
 |
3 |
3 |
1 |
1 |
3 |
| 67 | Ketone |
[#6][CX3](=[O])[#6] |
 |
150 |
88 |
4 |
6 |
223 |
| 68 | Mannich Base |
[OH1][c][c][#6][N,n][#6] |
 |
3 |
2 |
1 |
2 |
3 |
| 69 | Nitrile |
[C,c]-[C,c]#[N,n] |
 |
85 |
20 |
3 |
3 |
93 |
| 70 | Nitroarene |
[c][N+](=[O])[O-] |
 |
6 |
2 |
1 |
1 |
7 |
| 71 | O-Acyl Hydroxamic Acid |
[*][C](=[O])[N,n][O][C](=[O])[*] |
 |
4 |
4 |
2 |
2 |
5 |
| 72 | Phosphate |
[*][O][P]([O])([O])=O |
 |
8 |
29 |
1 |
4 |
32 |
| 73 | Phosphonate |
[#6][P]([O])([O])=O |
 |
37 |
26 |
1 |
3 |
43 |
| 74 | Phosphonohalogenate |
[C,O][P]([F,Cl,Br,I])([O])=O |
 |
9 |
15 |
1 |
1 |
18 |
| 75 | Phosphoramidocyanidate |
[#6][N][P]([O])(=O)[C]#[N] |
 |
2 |
3 |
1 |
1 |
5 |