Steroidal diglycosides from the starfish anthenea sibogae

Two steroidal diglycosides namely anthenoside R (1) and anthenoside S (2) were isolated from the methanol extract of the starfish Anthenea sibogae. Their structures were elucidated by means of 1D, 2D-NMR, HR-MS techniques and comparison of their NMR data with reported values. These compounds (1 and 2) were isolated from starfish Anthenea sibogae for the first time.