Anti-bacterial substances and microorganisms which produce them

Compound A having the following physicochemical properties:

• (1) Molecular weight:
• 390;
• (2) Molecular formula:
• C.sub.21 H.sub.26 O.sub.7 ;
• (3) Specific optical rotation:
• [.alpha]sub.D.sup.23 =-76.8.degree. (C=0.42, methanol);
• (4) Color and form of substance:
• White powder;
• (5) Ultraviolet absorption spectrum:
• .lambda..sub.max MeOH=250 nm(.epsilon.6300);
• (6) Infrared absorption spectrum:
• .nu..sub.max KBr=3300-3500, 2960, 2935, 1850, 1770, 1260, 915, 750 cm.sup.-1 ;
• (7) Solubility in solvents:
• readily soluble in chloroform, ethyl acetate, methanol;
• sparingly soluble in water;
• (8) .sup.13 C nuclear magnetic resonance spectrum (CDCl.sub.3) .delta.(ppm):
• 13.8, 13.9, 18.5, 22.4, 22.4, 24.9, 28.1, 28.4, 34.1, 34.8, 36.5, 41.7, 71.6, 141.0, 143.3, 145.0, 147.3, 165.0, 165.1, 165.4, 165.5;
• and
• (9) Rf value:
• Silica gel thin-layer chromatography (Keisel gel 60F.sub.254, Merck Co.) 0.35 in a solvent system of benzene:ethyl acetate:acetic acid (80:1:2 v/v %).

Compound B having the following physicochemical properties:

• (1) Molecular weight:
• 404;
• (2) Molecular formula:
• C.sub.22 H.sub.28 O.sub.7 ;
• (3) Color and form of substance:
• White powder;
• (4) Ultraviolet absorption spectrum:
• .lambda..sub.max MeOH=246 nm (.epsilon.6200);
• (5) Infrared absorption spectrum:
• .nu..sub.max KBr=2960, 2930, 2860, 1850, 1830, 1770, 1470, 1255, 930, 750, 735 cm.sup.-1 ;
• (6) Solubility in solvents:
• readily soluble in chloroform, ethyl acetate and methanol;
• sparingly soluble in water;
• and
• (7) .sup.13 C-Nuclear magnetic resonance spectrum (CDCl.sub.3):
• .delta.(ppm):
• 13.9, 14.0, 22.4, 22.5, 22.6, 26.7, 27.4, 29.2, 31.5, 34.7, 35.0, 35.9, 41.9, 66.5, 143.9, 144.0, 144.4, 144.7, 164.1, 164.4, 165.2, 165.8.