1. Flavanone derivatives of the formula I see diagramm : EP0173186,P12,F1 wherein Ar**1 and Ar**2 are each phenyl which is unsubstituted or monosubstituted to trisubstituted by OH, alkyl, alkoxy, acylamino, halogen, COOalkyl and/or NO2 and/or substituted by a methylenedioxy group, and the alkyl, alkoxy and acyl groups each have 1-7 C atoms, but wherein the HO group is only in the 6-position if at least one of the radicals Ar**1 and Ar**2 is substituted phenyl, and phosphoric acid esters thereof and the salts of these compounds.
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