Crystal structure of 4-nitro­phenyl 6-O-ethyl-β-d-galacto­pyran­oside monohydrate

The synthesis and crystal structure of the title compound, C(14)H(19)NO(8)·H(2)O, prepared in three steps from 6-O-ethyl-1,2;3,4-di-O-iso­propyl­idene-α-d-galacto­pyran­ose using protecting-group strategies employed in carbohydrate chemistry, is reported. The asymmetric unit consists of a single galactoside mol­ecule, in which the pyran­oid ring has a (4) C (1) conformation and the 4-nitro­phenyl moiety is essentially planar. In the crystal, each carbohydrate is surrounded by other d-galactose residues and water mol­ecules, linked by O—H⋯O hydrogen bonds involving all hy­droxy groups, giving a two-dimensional substructure lying parallel to (100) and extended into three dimensions by C—H⋯O inter­actions.