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4-hydroxycoumarin is a hydroxycoumarin that is coumarin in which the hydrogen at position 4 is replaced by a hydroxy group. It is a conjugate acid of a 4-hydroxycoumarin(1-). 4-Hydroxycoumarin is a natural product found in Ruta graveolens, Vitis vinifera, and Apis cerana with data available.

Umbelliferone is found in anise. Umbelliferone occurs widely in plants including Angelica species Phytoalexin of infected sweet potat

3 hydroxycoumarin is a metabolite of coumarin. In particular, coumarin is metabolized by CYP3A4 to form 3-hydroxycoumarin (PMID 17286538).

6-Hydroxycoumarin is a natural product found in Grevillea robusta and Amburana cearensis with data available.

7-Hydroxy-4-chromone is a member of chromones. 7-Hydroxy-4-benzopyrone is a natural product found in Actinidia valvata, Phlojodicarpus villosus, and other organisms with data available.

A hydroxycoumarin that is coumarin in which the hydrogen at position 4 is replaced by a hydroxy group." []

5-hydroxy-2H-chromen-2-one is a hydroxycoumarin. 2H-1-Benzopyran-2-one, 5-hydroxy- is a natural product found in Petchia erythrocarpa and Hydrangea chinensis with data available.

8-Hydroxycoumarin is a natural product found in Murraya paniculata and Murraya exotica with data available.