while a designation of S denotes a counter-clockwise direction of substituent priority.

Chirality centers

A chirality center (chiral center) is a type of stereocenter. A chirality center is defined as an atom holding a set of four different ligands (atoms or groups of atoms) in a spatial arrangement which is non-superposable on its mirror image. Chirality centers must be sp³ hybridized, meaning that a chirality center can only have single bonds.

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