We are reviewing the formulation for Amlodipine,so we are looking for s-amlodipine . If you can provide us it,please send us your best price and certificate of analysis with together sample 10g asap. For reference, our specification is as below.. Assay: 99% ↑ R Foam(Amlodipine) : 2% ↓ Single impurity : 0.1% ↓ Total impurity : 1.0% ↓ Impurity : 3-ethyl-5-methyl-2-[(2- aminoethoxy)methyl]methyl]-4-(2- chlorophenyl)-6-methylpyridine-3,5- dicarboxylate : 0.3% ↓ I am looking forward for your response.