title: Effects of unsymmetrical ester substituted 1,4-dihydropyridine derivatives and their optical isomers on contraction of smooth muscle.
abstract: The optical isomers of two nifedipine-like 1,4-dihydropyridine derivates have been synthesised and tested in vitro. The (-)-isomer (S-configuration of both compounds) was more potent than the racemate, which in turn was more potent than the (+)-isomer (R-configuration). The S-configuration isomers are approximately ten times more potent that nifedipine, and may represent the optimal structure and configuration for binding to and inhibiting calcium channels.
mesh_terms: D000818:Animals; D001013:Aorta, Thoracic / Q000187:drug effects; D005260:Female; D006168:Guinea Pigs; D066298:In Vitro Techniques; D008297:Male; D009119:Muscle Contraction / Q000187:drug effects*; D009130:Muscle, Smooth / Q000187:drug effects*; D009131:Muscle, Smooth, Vascular / Q000187:drug effects*; D009543:Nifedipine / Q000031:analogs & derivatives / Q000494:pharmacology*; D011725:Pyridines / Q000494:pharmacology*; D011817:Rabbits; D013237:Stereoisomerism; D014649:Vas Deferens / Q000187:drug effects
chemical_list: D011725:Pyridines; D009543:Nifedipine