Hipposulfates A and B, new sesterterpene sulfates from an Okinawan sponge, Hippospongia cf. metachromia

Two new sesterterpene sulfates, hipposulfates A (1) and B (2), have been isolated from an Okinawan sponge, Hippospongia cf. metachromia and their structures elucidated by interpretation of spectroscopic data. Both compounds contain an enolsulfate functionality. Hipposulfate A (1) showed moderate cytotoxicity.