Two new 24-hydroxylated asterosaponins from Culcita novaeguineae

Two new 24-hydroxylated asterosaponins, sodium (20R,24S)-6α-O-(4-O-sodiumsulfato-β-d-quinovopyranosyl)-5α-cholest-9(11)-en-3β,24-diol 3-sulfate (1) and sodium (20R,24S)-6α-O-[3-O-methyl-β-d-quinovopyranosyl-(1 → 2)-β-d-xylopyranosyl-(1 → 3)-β-d-glucopyranosyl]-5α-cholest-9(11)-en-3β,24-diol 3-sulfate (2), were isolated from the starfish Culcita novaeguineae. Their structures were elucidated by extensive spectral analysis and chemical evidences.