| 摘要 |
PURPOSE:Physiologically active substance P-725A. Characteristics thereof are as follows: Acidic oil-soluble colorless prismatic crystal. Melting point: decomposes at 165-170 deg.C. Elementary analysis: C 45.95, H 4.45, N 8.94, O 41.22. Molecular weight: 157. Molecular formula: C6H7NO4. Specific rotation: [alpha]<2>D<5>=+48.9 (C=1.0, methanol). Color reaction: positive to iodo reaction, ninhydrin reaction, etc.; negative to naphthoresorcinol-sulfuric acid reaction. Solubility: soluble in methanol, etc., easily soluble in tetrahydrofuran, etc. and slightly soluble in benzene, etc.UV absorption spetrum: for example, shows absorption maximum at 293nm (E<1>1%cm 758) in methano |
