2932: Heterocyclic compounds with oxygen hetero-atom(s) only

293211: Tetrahydrofuran 293212: 2-furaldehyde (furfuraldehyde) 293213: Furfuryl alcohol and tetrahydrofurfuryl alcohol 293219: Heterocyclic compds cntg an unfused furan ring in the structure, nes 293221: Coumarin, methylcoumarins and ethylcoumarins 293229: Lactones, nes 293291: Isosafrole 293292: 1- 1,3-Benzodioxol-5-Yl Propan-2-one 293293: Piperonal 293294: Safrole 293299: Heterocyclic Compounds With oxygen Hetero-Atom[S] only (Excl. Compounds Containing Unfused Furan Ring, W 2932: Heterocyclic compounds with oxygen hetero-atom(s) only