“…, 64.5; H , 5.404,; M, 372). Photobvomination and Subsequent Hydrolysis of Metlzyl 0-Methylhypopsoromate (23) .--The hypopsoromate ( 23) (500 mg) was boiled under reflux in carbon tetrachloride (18 ml) over a 100 W tungsten lamp and treated dropwise with bromine (232 mg) in carbon tetrachloride (10 ml) over 1 h. After a further 20 min the solution was cooled, diluted with ethyl acetate, and washed with water. The crude product was boiled under reflux with dioxan (60 ml) and water (30 ml) for 22.5 h. The crude product was chromatographed over silica gel with 10-40~0 ethyl acetate-light petroleum as eluant.…”