Antibiotic saframycin S and process for producing the same

An antibiotic substance, saframycin S, having the following physico-chemical characteristics:

• color and appearance:
• dark yellow powder;
• melting point:
• 107.degree.-115.degree. C.;
• specific rotation:
• [.alpha]sub.D.sup.25 =+32.5 (0.5 methanol);
• elementary analysis:
• C:
• 61.09%, H:
• 6.67%, N:
• 7.49%
• C:
• 61.45%, H:
• 6.18%, N:
• 7.48%
• molecular weight:
• 553;
• empirical formula:
• C.sub.28 H.sub.30 N.sub.3 O.sub.8.sup.+.OH.sup.-
• ultraviolet absorption spectrum as shown in FIG. 1:
• UV .lambda..sub.max.sup.MeOH nm (log .epsilon.):
• 268 (4.21)
• UV .lambda..sub.min.sup.MeOH nm (log .epsilon.):
• 234 (3.92);
• infrared absorption spectrum as shown in FIG. 2:
• IR .sub.max.sup.CHCl.sbsp.3 cm.sup.-1 :
• 3400, 1720, 1680, 1650
• NMR spectrum (C.sub.6 D.sub.5 N) as shown in FIG. 3:
• .delta.:
• 1.88 (3H, s), 2.30 (3H, s),
• 2.48 (3H, s), 2.72 (3H, s),
• 3.82 (3H, s), 3.85 (3H, s),
• 5.46 (1H, s).
• or a pharmaceutically acceptable acid addition salt thereof.