1: 4-(dihydroxyboryl)benzoic acid With N,N-diethanolaminomethyl polystyrene in tetrahydrofuran T=20°C; 1 h; 2: diethylamine With water; benzotriazol-1-ol; diisopropyl-carbodiimide T=20°C; 18 h; 3: in tetrahydrofuran; water T=20°C; 0.0166667 h; Further stages.;