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Covering: 1959 to 2013 Silybin, a secondary metabolite isolated from the seeds of the blessed milk thistle (Silybum marianum) was discovered as the first member of a new family of natural compounds called flavonolignans in 1959. Over the years it has received the research attention of many organic chemists. This research has resulted in a number of semisynthetic derivatives prepared in an effort to modulate and better target the biological activities of silybin or to improve its physical properties, such as its solubility. A fundamental breakthrough in silybin chemistry was the determination of the absolute configurations of silybin A and silybin B, and the development of methods for their separation. This review covers articles dealing with silybin chemistry and also summarizes all the derivatives prepared. [ABSTRACT FROM AUTHOR]

Review: data form 1959 to 2013; 94 refs. [ABSTRACT FROM AUTHOR]

Abstract: NMR studies showed that 11-demethylcyclosporin A (cyclosporin E) and 11-demethylcyclosporin B exist as single species both in polar and nonpolar solvents. They adopt the same conformation that was found in the solid state. [ABSTRACT FROM AUTHOR]