| CH | catechin hydrate |
| CI | combination index |
| DMSO | dimethyl sulfoxide |
| GA | gallic acid |
| IC | inhibitory concentration |
| KA | kojic acid |
| L-DOPA | 3,4-dihydroxy-L-phenylalanine |
| NMR | nuclear magnetic resonance |
| OPLS | orthogonal partial least squares to latent structures |
| PSE | pressurized solvent extraction |
| RP | Rheum palmatum |
| RPE | Rheum palmatum extract |
| TYR | tyrosinase |
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