2,5-di-O-benzyl-1,6-di-O-dimethoxytriphenylmethyl-3,4-O-isopropylidene-L-iditol

(4R,5S)-2,2-二甲基-1,3-二氧戊环-4,5-二甲醛

3,4-disoprpylidene-1,6-di-O-triphenylmethyl-D-mannitol diacetate