Text translated from German

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Content in this article was translated and adapted from the German Wikipedia article on dikegulac, accessed on 2017-01-07 at https://de.wikipedia.org/wiki/Diacetonketogulons%C3%A4ure. The detail on dikegulac's role in vitamin C synthesis in the introduction and the sections on regulations and Ginkgo Gate were translated and adapted. The section on synthesis was omitted. Sections on Application methods, phytotoxicity, reversing growth inhibition, and commercial formulations were added.