The invention relates to the use of complexes and chelates resp., of antibiotics, especially azithromycin, with bivalent and/or trivalent metals in the obtaining of antiulcer drugs, to new complexes and chelates resp., of antibiotics with bivalent and/or trivalent metals and to processes for the obtaining thereof.

The invention relates to the use of complexes and chelates resp., of antibiotics, especially azithromycin, with bivalent and/or trivalent metals in the obtaining of antiulcer drugs, to new complexes and chelates resp., of antibiotics with bivalent and/or trivalent metals and to processes for the obtaining thereof.

The disk recording appts. sequentially inputs data to a memory (14) at one transfer rate. This data is subsequently read out at a second, higher transfer rate and recorded to disk (2). The amounts of data read from the memory are set so that there is a writing space in memory. During playback, the recorded data are reproduced at a rate, higher than the rate for outputting the data, and stored in a...

((2-Amino-3,4-dioxo -1-cyclo-buten-1-yl) amino)alkyl)acid derivs. of formula (I) and their salts are new: R1 = H, 1-6C alkyl or 7-12C phenylalkyl; R2 = H, 1-6C alkyl, 2-6C alkenyl or 7-12C phenylalkyl; or R1 + R2 = Z; Z = -CH2CH2-, -CH2C(R6)(R7)CH2- or -CH2C(R8)(R9)-C(R10)(R11)CH2-; R6, R8, R10 = H, 1-6C alkyl or OH; R7, R9, R11 = H or 1-6C alkyl; A = 1-6C alkylene or 2-6C alkenylene; X = CO2R3, P...