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10.1080/21645515.2017.1316909 65 SupsrisunjaiC.ThuangtongR
Are GHK-Cu Injections Supported by Clinical Evidence
Available online at: (Accessed May 12, 2025)
In the 1 H NMR spectrum, the area data for the methyl proton in levulinic acid (4, -CH3) was used as a reference, and the ratio of its peak area to the hypomethyl group in tartaric acid (5, CH) was 4.5
