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butenolide
Butenolides are a class of lactones with a four-carbon heterocyclic ring structure.〔Joule JA, Mills K. (2000). Heterocyclic Chemistry 4th ed. Blackwell Science Publishing: Oxford, UK〕 They are sometimes considered oxidized derivatives of furan. The simplest butenolide is 2-furanone, which is a common component of larger natural products and is sometimes referred to as simply "butenolide". A common biochemically important butenolide is ascorbic acid (vitamin C). Butenolide derivatives known as karrikins are produced by some plants on exposure to high temperatures due to brush fires. In particular, 3-methyl-2''H''-furo()pyran-2-one was found to trigger seed germination in plants whose reproduction is fire-dependent.
== References ==
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