PROBLEM TO BE SOLVED: To provide a pharmaceutical composition containing a gold (III) complex and a method for producing the same. The gold (III) complex of the present invention has the following chemical formula (I). R1 is from aryl and amine, R2 is from the first group (alkyl and cycloalkyl), R3 is hydrogen, halogen, nitro, cyano, alkyl, alkyloxy, alkylamino, aminodialkyl, hydroxyalkyl, trialkylsilyl. , Aryldialkylsilyl, alkylthio, cycloalkyl, from the second group (aryl, heterocyclic, polycyclic, amino acid, peptide, carbohydrate derivative), R4 is the first group, alkylalkoxy, alkylamino, dialkylamino, alkylthio, Trialkylphosphino, dialkylarylphosphino, alkyldiarylphosphino, triarylphosphino, each independently selected from the second group.
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