Abstract: Compounds of the following formula are used for inhibiting cell proliferation: wherein R, Q1, Q2, X are as defined in the specification.

Abstract: The invention relates to a series of new compounds, to methods for preparing the compounds, to compositions containing said compounds which are useful in the human and veterinary medical practice, and to methods for treating patients suffering from certain illnesses with said compounds, the new compounds having the general formula I ##STR1## or the tautomeric forms thereof in which the R.sup.1 -substituted cyano-guanidyl radical is placed in the 2-, 3- or 4-position of the pyridine ring, and in which R.sup.1 stands for a straight or branched, saturated or unsaturated, aliphatic hydrocarbon radical having from 1 to 8 carbon atoms, a cycloalkyl or cycloalkenyl radical having from 3 to 7 carbon atoms, an aryl or an aralkyl radical, and R.sup.

Abstract: The present invention relates to pivaloyloxymethyl D(-)-.alpha.-aminobenzylpenicillinate of the formula I in a novel and improved form, i.e. the crystalline form ##SPC1##To methods of producing said crystalline pivaloyloxymethyl D(-)-.alpha.-aminobenzylpenicillinate and to pharmaceutical preparations containing said crystalline pivaloyloxymethyl D(-)-.alpha.-aminobenzylpenicillinate.Crystalline pivaloyloxymethyl D(-)-.alpha.-aminobenzylpenicillinate has no bitter taste, is only slightly soluble in water, and is stable and readily absorbable.