(Z)-1,2:5,6-Di-O-isopropylidene-α-d-ribo-hexofuranos-3-ulose O-benzyloxime

The title compound, C19H25NO6, is a Z diastereomer in which the phenyl ring of the 3-benzyloxime substituent and the 5,6-O-isopropylidene acetal are both located on the Si-face of the C=N double bond. Intermolecular C—H⋯O interactions result in helical chains along the b axis of the monoclinic unit cell.