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Involved in angular furanocumarin biosynthesis. Converts (+)-columbianetin to angelicin. Produces also some hydroxycolumbianetin as a by-product. No activity with demethylsuberosin, (+)-marmesin, 5-hydroxymarmesin, psoralen, bergaptol, xanthotoxol, bergapten, xanthotoxin, isopimpinellin, cinnamic acid, 4-coumaric acid, 2-coumaric acid, ferulic acid, coumarin, herniarin, scopoletin, or umbelliferone. The reaction mechanism is initiated by the abstraction of syn-C-3'-hydrogen.
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