STARFISH SAPONINS .48. ISOLATION OF 9 STEROL CONSTITUENTS (6 GLYCOSIDES AND 9 POLYHYDROXYSTEROIDS) FROM THE STARFISH SOLASTER-BOREALIS

This paper reports a complete steroid glycoside and polyhydroxysteroid analysis of the starfish Solaster borealis, collected at Mutsu Bay, Japan. The glycosides include a new pentaglycoside steroid sulfate (''asterosaponin''), designated solasteroside A [1], two new sulfated 24-O-diglycosides, both with the common 5-alpha-cholesta-3-beta,6-alpha,8,15-alpha,24-pentaol aglycone, borealosides A [2] and B [3], two new 24-O-(3-O-methyl)xylosides, borealosides C [4] and D [5], having the same aglycone with an additional hydroxy group at 4-beta-position in 5, and the known amurensoside B, previously isolated from Asterias amurensis. Among the polyhydroxysteroid constituents, four (7-10) are new, and five (11-15) have previously been isolated from starfishes.