| Label | Id | |
|---|---|---|
| arsanyl | 33105 | |
| arsolane | 33132 | |
| aryne | 33665 | |
| arynes | 33665 | |
| as-indacene | 33062 | |
| atom | 33250 | |
| azacyclotridecan-2-one | 172332 | |
| azanide | 29337 | |
| azanylidene | 29339 | |
| azanylium | 29338 | |
| benzamidoxime | 83354 | |
| benzene-1,3,5-tricarboxylate | 33059 | |
| benzenecarboximidamide | 41033 | |
| benzenesulfonates | 53348 | |
| benzimidazol-1-ide | 33173 |