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doi: 10.1111/j.1749-6632.2003.tb03177.x

Expert Opinion on Therapeutic Targets, 20(10), 12591265
Discovery and activity of (1R,4S,6R)-N-[(1R)-2-[4-cyclohexyl-4-[[(1,1- dimethylethyl)amino]carbonyl]-1-piperidinyl]-1-[(4- fluorophenyl)methyl]-2-oxoethyl]-2-methyl-2- azabicyclo[2.2.2]octane-6-carboxamide (3, RY764), a potent and selective melanocortin subtype-4 receptor agonist

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Compare GHK-Cu Topical Serum by mechanism, evidence strength, expected timeline, side-effect profile, and whether its primary use case matches your goal
These injection site reactions occur when you repeatedly inject into the same small area
