The extraction and solvent fi＇actionation of red alga Symphyocladia latiuscula, and repeated column chromatography led to isolation of 17 compounds： cholesterol （1）, 313,5β-dihydroxy-B-norcholestan-6βcarboxaldehyde （2）, 6β-hydroxy-cholest-4-ene- 3-one （3）, 1-O-myristoyl-3-O-（6＇-sulfo-α-D-quinovopyranosyl）glycerol （4）, 1-O-palmitoyl-3-O-（6＇-sulfo-u-19-quinovopyranosyl） glycerol （5）, 1-O-palmitoyl-3-O-[α-D-galactopyranosyl（1→6）β-D-galactopyranosyl] glycerol （6）, 1-O-palmitoyl-3-O-β-D- galactopyranosylglycerol （7）, methyl hexadecanoate （8）, methyl stearate （9）, hexadecanoic acid （10）, γ-n-butyl cis-aconiate （11）, α-n-Butyl cis-aconiate （12）, phenethylamine （13）, 3,5-dibromo-L-tyrosine （14）, 3-methylbutylamine （15）, methyl pyroglutamate （16）, n-butyl pyroglutamate （17）. The structures of these compounds were identified by NMR spectroscopy and mass spectrometry, and compared with those reported in the literature. All the compounds were isolated from Symphyocladia genus for the first time. These compounds were investigated for their inhibitory effects on human recombinant aldose reductase in vitro. Of the compounds, 1-O-palmitoyl-3-O-β-D-galactopyranosylglycerol （7） demonstrated moderate enzyme inhibition.
