Antibiotic roridin L-2 and its use

Antibiotic roridin L-2 having the structural formula ##STR3## and characterized by:

• (a) an infrared spectrum in potassium bromide having principal absorptions at 3450, 2970, 1782, 1750, 1640, 1600, 1435, 1284, 1180, 1084, 1030 and 965 reciprocal centimeters
• (b) [.alpha]sub.D 23=+83.6.degree. (1.0% in chloroform)
• (c) a proton magnetic resonance spectrum in CDCl.sub.3 having principal signals at (s=singlet, d=doublet, t=triplet, m=multiple) 0.83s, 1.15d (J=6), 1.72s, 2.02m, 2.81d (J=4), 3.13d (J=4), 3.5-4.0 (complex signals;
• area=3), 4.80d (J=2), 5.49 broad d (J=6), 5.22-6.02 (complex signals;
• area=3), 6.08dd (J=4,6) 6.06t (J=11);
• and 7.60dd (J=11,15) parts per million downfield from tetramethylsilane
• (d) a carbon 13 nuclear magnetic resonance spectrum in CDCl.sub.3 having principal signals in parts per million, at:
• ______________________________________ Ppm (downfield Ppm (downfield from TMS) from TMS) ______________________________________ 173.95 73.46 167.43 69.74 166.46 66.83 143.37 66.34 140.57 65.59 138.89 62.51 130.53 48.86 118.88 48.00 118.72 44.28 116.67 36.19 85.38 29.23 78.91 28.04 78.42 23.19 77.02 CDCl.sub.3 21.14 75.62 18.44 75.40 6.57 ______________________________________