1: 1.2 g / 36 percent HCl / 1 h / Heating 2: 66 percent / sodium carbonate / H2O / 1 h / 80 °C 3: 2.) ascorbic acid / 1.) tyrosinase, pH=6.8, r.t., 1 h View Scheme

1: 1.2 g / 36 percent HCl / 1 h / Heating 2: 2.) ascorbic acid / 1.) tyrosinase, pH=6.8, r.t., 1 h View Scheme

hydrogenchloride 1 h; Heating;