A solution of 3 (0.5 g, 2.3 mmol) in 5 ml of diluted H2SO4 was heated at 50°for 30 min. The solution was neutralized with NaaCOs and extracted with EtOAc. Evaporation of the solvent gave a residue which was recrystallized from EtOH (0.27 g, 66%): mp 169-171°; uv (95% ethanol) Xmax 247 and 372 nm (t 14700 and 5600); ir (Nujol) 1685 cm"1 (C=0).
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