| abstract |
WB2663 substance-producing bacteria belonging to the genus Pseudomonas are cultured to produce a physiologically active substance, from which are isolated neutral substances WB2663A, WB2663B and WB2663C having respective specific rotations [ alpha ]D23: -36 DEG (C=0.5, CH2Cl2), [ alpha ]D23: -12 DEG (C=0.5, CH2Cl2), [ alpha ]D23: -9 DEG (C=0.5, CH2Cl2), These substances have an excellent antitumor effect. |