A sample of compound 2 (5.0 mg) was dissolved in dry pyridine (1.0 mL), and Ac2O (0.5 mL) was subsequently added. After stirring at 40 °C for 48 h, the mixture was concentrated in vacuo to dryness, and the residue was purified by pHPLC with MeCN-H2O (35:65, v/v) at a flow rate of 4 mL/min to yield 2a (1.0 mg). Following the above procedure, compound 12 was acetylated to yield 12a.
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