A compound active in the constitutive nitric oxide synthetase assay, the su
lfonoglycolipid 3-O-(6'-deoxy-6'-sulfo-alpha-D-glucopyranosyl)-1-O-oleoyl-2
-O-palmitoylglycerol, was isolated from the brown alga Dictyota ciliolata.
This compound was characterized by several spectroscopic techniques and is
the first reported occurrence of this class of compound in brown algae.