Antibiotics a28695a and a28695b and a process for production thereof
Abstract
Abstract 1. THE ANTIBIOTIC A28695A WHICH IS A WHITE CRYSTALLINE COMPOUND MELTING AT 97 TO 99*C., HAS AN APPROXIMATE MOLECULAR WEIGHT OF 834 AS DETERMINED BY MASS SPECTROMETRY; HAS THE APPROXIMATE ELEMENTAL COMPOSITION OF 63.31% CARBON, 8.83% HYDROGEN AND 28.03% OXYGEN; WHICH IN THE FORM OF ITS SODIUM SALT HAS ONE TITRATABLE GROUP HAVING A PKA VALUE OF 5.51 AS DETERMINED BY ELECTROMETRIC TITRATION IN 66% AQUEOUS ETHANOL; WHICH IN THE FORM OF ITS MIXED SODIUM-POTASSIUM SALT IS A WHITE CRYSTALLINE COMPOUND MELTING AT 161-165*C., WHICH IS INSOLUBLE IN WATER, SLIGHTLY SOLUBLE IN METHANOL AND IS SOLUBLE IN DIETHYL ETHER, ETHYL ACETATE, ACETONE, CHLOROFORM AND BENZENE; HAS A SPECIFIC ROTATION (A)D25+14.07* (C=2, METHANOL); WHICH AS A SOLUTION IN CHLOROFORM HAS THE FOLLOWING DISTINGUISHABLE BANDS IN ITS INFRARED ABSORPTION SPECTRUM: 3.1-3.3, 3.4, 3.47, 6.24, 6.84, 7.00, 7.25, 7.37, 7.49, 7.68, 7.78, 8.1, 8.47, 8.61, 8.95, 9.11, 9.20, 9.42, 9.5, 9.80, 9.98, 10.24, 10.54, 1087, 11.09, 11.5 AND 11.66. MICRONS; AND WHICH SHOWS NO SIGNIFICANT ABSORPTION IN THE ULTRAVOILET REGION OF THE SPECTRUM.
Inventors
- 👤 R Hamill
- 👤 M Hoehn
Bibliographic Details
Claims Analysis
Total Claims: 2References Cited (Backward Citations)
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| 3.5 Years (Year 4) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
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| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |