A physiologically active substance NK13650P3 having the following physicochemical properties or a pharmacologically acceptable salt thereof. 1) Appearance: pale yellow powder 2) Molecular formula: C 29 H 37 N 7 O 15 3) Molecular weight: 723 4) Hydrogen nuclear magnetic resonance spectrum: spectrum measured at 600 MHz in heavy water contains the following signals: chemical shift value ´ ppm: 7.05(1H,3), 7.00(1H,d), 6.96(1H,d), 6.83(1H,s), etc. 5) Carbon nuclear magnetic resonance spectrum: spectrum measured at 150 MHz in heavy water contains the following signals: chemical shift value ´ ppm: 181.5(s), 181.4(s), 179.9(s), 179.2(s), 174.5(s), 174.3(s), 271.5(s), 165.4(s), etc. 6) Ultraviolet light spectrum: spectrum measured in aqueous solution contains the following UV absorption bands: » max (MeOH): 196.5 nm, 224.5 nm, 322.5 nm 7) Solubility: highly soluble in water but insluble in methanol, acetone, ethyl acetate, chloroform and dimethyl sulfoxide. 8) Coloration reaction: positive to phosphomolybdic acid/sulfuric acid reaction and Rydon-Smith reaction.
