2-(2,4,6-trimethyl-phenyl)-2,5,6,7-tetrahydro-pyrrolo[2,1-c] [1,2,4]triazol-4-ylium perchlorate; (4aR,9aS)-6-bromo-4-hydroxy-4,4a,9,9a-tetrahydroindeno[2,1-b][1,4]oxazin-3(2H)-one; potassium carbonate in isopropanol acetate T=23°C; 24 h; Resolution of racemate;