Abstract
We propose the detection and quantification of metabolites of 6-nitrodopamine, 6-cyanodopamine, 6-nitrodopa, 6-nitroadrenaline and 6-bromodopamine, new endogenous catecholamines recently discovered in tissues such as human umbilical cord, ventricles and atria of rabbits and rats, endothelium of snakes and aortic rings of turtles. 6-nitrodopamine was also considered the most potent endogen…