English name: Paclitaxel side chain acid English name: (4S, 5R) -3-Benzoyl-2- (4-methoxyphenyl) -4-phenyl-5-oxazolidinecarboxylic acid CAS: 949023-16-9 content above 98% Packing: 1 kg / 5 kg (intermediate) paclitaxel side chain melting point of this product is 150 ~ 160 ℃. Specific rotation to take paclitaxel side chain, accurately weighed, dissolved in ethanol and the solution made from 10mg 1ml of determination (Chinese Pharmacopoeia 2005 edition of Appendix VI E) according to the law, the specific rotation of -46 ~ -54 °. Taxol side chain to identify the test solution liquid retention time consistent with the reference solution liquid retention time. Loss on drying oven at 105 ℃ drying to constant weight, less weight loss should not exceed 1.0%. Taxol side chain of related substances is less than 2% for high performance liquid chromatography (Chinese Pharmacopoeia 2005 edition two Appendix VD) test. Purposes: for the basic raw material of paclitaxel products