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GS 389 is a novel tetrahydroisoquinoline analog. GS-389 significantly increased cGMP levels in the rat aorta and inhibited cGMP phosphodiesterase from the rabbit brain. It has vasorelaxant properties.

GS 389 ((±)-O,O-Dimethylcoclaurine) is a tetrahydroisoquinoline. GS-389 inhibites Cyclic AMP and cyclic AMP dependent phosphodiesterases from rat atrial and ventricular tissue. GS-389 relaxes the contraction induced by phenylephrine and high K+ in rat aortic rings[1].

[1] Chang KC, et al. Different pharmacological characteristics of structurally similar benzylisoquinoline analogs, papaverine, higenamine, and GS 389, on isolated rat aorta and heart. Can J Physiol Pharmacol. 1994;72(4):327-334. DOI:10.1139/y94-049