Trifluoro-acetic acid 2-methoxy-3,5-bis-(2,2,2-trifluoro-acetoxy)-6-(2,2,2-trifluoro-acetoxymethyl)-tetrahydro-pyran-4-yl ester 生成 Trifluoro-acetic acid (2S,3R,4S,5S,6R)-2-methoxy-3,5-bis-(2,2,2-trifluoro-acetoxy)-6-(2,2,2-trifluoro-acetoxymethyl)-tetrahydro-pyran-4-yl ester 、 Trifluoro-acetic acid (2R,3S,4R,5R,6S)-2-methoxy-3,5-bis-(2,2,2-trifluoro-acetoxy)-6-(2,2,2-trifluoro-acetoxymethyl)-tetrahydro-pyran-4-yl ester