| 摘要 |
<p>Substances WB2663A, WB2663B and WB2663C are produced by culturing a WB2663-producing bacterium belonging to the genus Pseudomonas to form physiologically active substances and isolating therefrom neutral substances respectively having the following specific rotation: [α]23 = -36° (C=0.5 in CH¿2?Cl2), [α]?23¿ = -12° (C=0.5 in CH¿2?Cl2), and [α]?23¿ = -9° (C=0.5 in CH¿2?Cl2). They have each an excellent antitumor activity.</p> |
