1: 2-amino-6-methoxy-benzthiazole With sulfuric acid; sodium nitrite in acetic acid; propionic acid T=0 - 5°C; 1 h; 2: N,N-diethylaniline With sodium hydroxide in acetic acid; propionic acid; acetonitrile T=0 - 4°C; pH=6 - 7; 2 h;