Crystal structure of 2-benzene-sulfon-amido-3-hy-droxy-propanoic acid.

In the title compound, C9H11NO5S, the O=S=O plane of the sulfonyl group is twisted at a dihedral angle of 52.54 (16)° with respect to the benzene ring. The dihedral angle between the carb-oxy-lic acid group and the benzene ring is 49.91 (16)°. In the crystal, C-H⋯O, N-H⋯O and O-H⋯O hydrogen bonds link the mol-ecules into (001) sheets.

Crystal structure of (2S)-3-methyl-2-[(naphthalen-1-ylsulfon-yl)amino]-butanoic acid.

The title compound, C15H17NO4S, was synthesized from l-valine and naphthalene-1-sulfonyl chloride. The hydrogen-bonded carb-oxy-lic acid groups form a catemer C(4) motif extending along [100]. The catemer structure is reinforced by a rather long N-H⋯O hydrogen bond, between the sulfamide N-H group and a carb-oxy-lic acid O atom [H⋯O = 2.52 (2) Å], and a C-H⋯O hydrogen bond.