A new 1:1 molecular complex of triterpene glycoside ammonium glycyrrhizate (GC) with flavonoid rutin (Rut) was obtained in aqueous ethanol. The stability constant (9.7±0.2)×104 (mol/L)–1 calculated for the via isomolar curves. complexation studied by UV- and ATR IR-Fourier spectroscopy a method series. hydrogen bonds hydrophobic interactions are formed complex. preliminary antioxidant activity ...