1: N-ethyl-N-[2-(methoxycarbonyl)ethyl]aniline With sodium acetate; hydroxylamine-o-sulphonic acid in water T=0°C; pH=5 - 6; 2: 5-nitrobenzo[c]-1,2-thiazole-3-diazonium hydrogensulfate T=0°C; pH=4 - 5; 1 h;