| 293211 | 293211 - Heterocyclic compounds; with oxygen hetero-atom(s) only, cont |
| 293212 | 293212 - Heterocyclic compounds; with oxygen hetero-atom(s) only, cont |
| 293213 | 293213 - Heterocyclic compounds; with oxygen hetero-atom(s) only, cont |
| 293214 | 293214 - Heterocyclic compounds; with oxygen hetero-atom(s) only, cont |
| 293219 | 293219 - Heterocyclic compounds; with oxygen hetero-atom(s) only, cont |
| 293220 | 293220 - Heterocyclic compounds; with oxygen hetero-atom(s) only, cont |
| 293221 | 293221 - -- Coumarin, methylcoumarins and ethylcoumarins |
| 293229 | 293229 - -- Other lactones |
| 293290 | 293290 - Heterocyclic compound,oxygen hetero-atom(s) only,nes |
| 293291 | 293291 - Heterocyclic compounds; with oxygen hetero-atom(s) only, (oth |
| 293292 | 293292 - Heterocyclic compounds; with oxygen hetero-atom(s) only, (oth |
| 293293 | 293293 - Heterocyclic compounds; with oxygen hetero-atom(s) only, (oth |
| 293294 | 293294 - Heterocyclic compounds; with oxygen hetero-atom(s) only, (oth |
| 293295 | 293295 - Heterocyclic compounds; with oxygen hetero-atom(s) only, (oth |
| 293296 | 293296 - Heterocyclic compounds; with oxygen hetero-atom(s) only, (oth |
| 293299 | 293299 - Heterocyclic compounds; with oxygen hetero-atom(s) only, no l |