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Heterocyclic compounds with oxygen heteroatom(s) only (1) Tetrahydrofuran (2) 2- Furaldehyde (Furfuraldehyde) (3) Furfuryl alcohols and tetrahydrofurfuryl alcohol (4) Hydroxy –3-dibenzfuren carboxylic acid (5) Coumarin, methyl coumarins and ethyl coumarins (6) Phenolphthalein (7) Isosafrole (8) 1-(1, 3-Benzodioxol-5-yl) propan-2-one (9) Piperonal (10) Safrole (11) Tetrahydrocannabinols (all isomers) Deleted