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A new steroid glycoside, capelloside A (1), was isolated from the ethanolic extract of the starfish Ogmaster capella along with the previously known coscinasteroside B (2). The structures of 1 was elucidated by extensive NMR and ESI-MS techniques as (24 S)-24- O-(3- O-methyl-β-D-xylopyranosyl)-5α-cholestane-3β,6β,8,15α,24-pentol 15- O-sulfate (1). Compounds 1 and 2 decreased intracellular ROS (reactive oxygen species) levels in murine macrophages of the RAW 264.7 cell line at induction by endotoxic lipopolysaccharide (LPS) from E. coli by 60% and 41%, correspondingly.

The Influence on LPS-Induced ROS Formation in Macrophages of Capelloside A, a New Steroid Glycoside from the StarfishOgmaster capella