Add time:07/20/2019         Source:sciencedirect.com

The 6,7-dichloro derivative of 3-hydroxy-2-quinoxalinecarboxylic acid (diCl-HQC) is a relatively potent antagonist at the two excitatory amino acid receptor subtypes activated by N-methyl-d-aspartate (NMDA) and kainic acid. It antagonizes NMDA-induced excitation in the frog spinal cord (pA2 5.8), i.e. with a potency similar to d-2-amino-7-phosphonoheptanoate (d-AP-7). It also antagonizes NMDA-induced sodium efflux from rat brain slices (pA2 5.6). The compound inhibits kainic acid-induced sodium efflux from rat brain slices with a pA2 of 5.4 and it inhibits [3H]kainic acid binding to rat brain membranes with a pKi of 5.4. DiCl-HQC is only weakly active at the quisqualate receptor. This spectrum of activities may make this compound a useful tool to investigate the pharmacology of excitatory amino acid receptors.

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