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IV (5.0g) was dissolved in dichloromethane (25ml) and an excess amount of diazomethane in dichloromethane (25ml) was added and the reaction mixture was allowed to stand overnight at room temperature. After acetic acid was added to decompose excess diazomethane the solution was distilled off and the residue (5.3 g) was deacetylated with 0.1N sodium methoxide in methanol at 0°C for 2 hr. and then the solution was acidified with 10% sulfuric acid. The crystalline precipitate was collected and recrystallized from water to yield pure needles in a yield of 3.38 g (96.6 %), mp 171-174°C.

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