The invention relates to insulin derivatives of the formula I IMAGE (I) in which R1 denotes H or H-Phe, R30 represents the radical of a neutral L-aminoacid and R31 represents a physiologically acceptable organic group of basic character with up to 50 carbon atoms, these derivatives having an isoelectric point between 5.8 and 8.5, processes for their preparation and their use, and agents containing these derivatives for the treatment of diabetes mellitus.
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