Tang and Cohen quantified this property by applying a continuity equation to an analog of the Poynting theorem in order to measure this property electromagnetically. The ORDs of molecules with this property can be altered in the vicinity of an absorption band. Calixarenes (“kuh-LICK-suh-renes”) that display an XXYZ or WXYZ substitution pattern possess a form of this property that arises from twisting in 3D space. Those macrocycles are said to possess the “inherent” form of this property. Mosher’s acid was historically used (-5[1])as a derivatizing agent for samples with this property until it was largely replaced by cyclodextrin-based stationary phases. Samples with this property display nonzero optical rotations unless they are racemic. For 10 points, name this property possessed by molecules that cannot be superimposed onto their mirror images. ■END■ (10[1])