Abstract
A simple and accurate method for determining levels of 4-([3,4-(methylenedioxy)benzyl]amino)-6,7,8-trimethoxyquinazoline, a novel cyclic GMP phosphodiesterase inhibitor, in dog plasma was developed. This method involves extraction with diethyl ether and reversed-phase high-performance liquid chromatography with ultraviolet detection. Regression analysis showed that the method was linear over the range 1.0-1000 ng/ml. The method was employed for the analysis of plasma samples in a preliminary pharmacokinetic study in beagle dogs.
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