Acetic acid (2R,3R,4R,5S,6S)-4,5-bis-benzyloxy-2-{2-[2-([1,3]dioxolan-2-ylmethoxy)-ethoxy]-ethoxy}-6-methyl-tetrahydro-pyran-3-yl ester 生成 (2R,3R,4S,5S,6S)-4,5-Bis-benzyloxy-2-{2-[2-([1,3]dioxolan-2-ylmethoxy)-ethoxy]-ethoxy}-6-methyl-tetrahydro-pyran-3-ol