1: S-(+)-6-methoxy-α-methyl-2-naphthalene acetic acid With potassium hydrogencarbonate in DMF (N,N-dimethyl-formamide) T=50 - 60°C; 1.5 h; 2: 4-(nitrooxy)butyl p-toluensulfonate in DMF (N,N-dimethyl-formamide) T=20°C; 25 h;

silver nitrate in acetonitrile T=20°C; 0.25 h;