O O O O O O OBn OBn BnO BnO BnO BnO BnO BnO BnO BnO BnO BnO BzO BzO BzO BzO BzO SEt SEt SEt SEt 93 80% I2, –25 °C OH OH 94 95 I2, rt 55% 96 BnO BnO O OH ...
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