abstract |
FIELD: organic chemistry, antibiotics. SUBSTANCE: invention relates to new cephalosporins of the formula (I) where values R 1 -R 6 , A and A 1 are given in description showing antibiotic activity. Invention relates to a method of synthesis of cephalosporins and pharmaceutical compositions based on thereof also. EFFECT: improved method of synthesis. 13 cl, 2 tbl |