Ecdy sones

C. has also been isolated in small amounts from plants, e. g. potato plants, from many pollens, isolated chloroplasts and from bacteria. It is a vitamin for many insects which require it as a precursor of ecdy-sone and related molting hormones. Commercially, C. is prepared from the spinal cords of cattle, or from wool grease. It was first synthesized chemically by Robinson and Woodward in 1951. For biosynthesis, see Terpenes. 

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