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Hi, I am looking for 4-hydroxymandelic acid (CAS Number: 184901-84-6). I need S and R enantiomers of this compound. I found 4-hydroxymandelic acid in Sigma, but can't find S and R enantiomer. I searched with emolecules.com and chemspider, and also Zinc database, but still can't find S and R enantiomer. Can anyone find this compound? Does anyone know a chemical company that do custom synthesis ? Thanks