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(2005) Synthesis of (R)-ar-turmerone and its conversion to (R)-ar-himachalene, a pheromone component of the flea beetle: (R)-ar-Himachalene is dextrorotatory in hexane, while levorotatory in chloroform.
(154) Once separated, it was determined that the dextrorotatory enantiomer imparted all of the beneficial antiplatelet activity, while the levorotatory enantiomer imparted all of the neurotoxicity of the racemate.
(159) The district court, with the Federal Circuit affirming, rejected this construction of the law, stating that the evidence overwhelmingly pointed to the unexpected characteristics of the dextrorotatory enantiomer, which was held to be nonobvious over the racemate.
Levosimendan, the levorotatory form, was shown to exert a positive inotropic effect in isolated cardiac preparations (41), with greater potency than the dextrorotatory isomer, dextrosimendan (42).
Will Nediger adds a couple of examples to Susan Thorpe's "Permed Ends" in the February issue: dexTROROTaTORy and PREtERPluPERfect.
CHEMICAL STRUCTURE: Dexmedetomidine is the dextrorotatory S-enantiomer of medetomidine, an agent used in veterinary medicine.