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The crude product was purified by flash silica gel column chromatography (20% EtOAc in hexanes) to afford the title compound

In the newer R / S system of designating chirality, based on the atomic numbers of atoms near the asymmetric carbon, cysteine (and selenocysteine) have R chirality, because of the presence of sulfur (or selenium) as a second neighbor to the asymmetric carbon atom

J Asset Off Anal Chem, 66: 5-12

Esquivel, J

While the passive technique focuses on drug and vehicle interaction and optimization to affect the stratum corneum structure, the active approach utilizes external energy to facilitate the transportation of drugs through the skin or by physically disrupting the outermost layer of the skin, known as the stratum corneum [230, 231]

not necessarily related to need in any way