1: 7-Hydroxy-4-(trifluoromethyl)-coumarin With sodium hydroxide 2: methyl 5-acetamido-4,7,8,9-tetra-OAc-2-chloro-3,5-dideoxy-β-D-glycero-D-galacto-2-nonulopyranosylonate in N,N-dimethyl-formamide T=20°C; 4 h; Further stages.;