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different properties which has been named cephalosporin N. Cephalosporin P consists of acidic sub- stances that are soluble in organic solvents, and are active mainly against Gram-positive organisms. Cephalosporin N cannot be extracted from aqueous solution by common organic solvents and is active against both Gram-positive and Gram-negative organisms.
Berthet et al. (1951) studied this question.