... European Journal of Pharmaceutical Sciences. ... solvent under reduced pressure resulted in a solid residue which was recrystallized from EtOH: Yield 83%; mp 61–62 °C (Bianchi et al., 1974: 58–60 °C); 1 H NMR δ 2.64 (s, 3H, Ox–CH 3 ), 3.83 (s, 3H, H 3 CO), 7.11 (d, J=8.8 Hz ...