Ritterazine A, a highly cytotoxic dimeric steroidal alkaloid, from the tunicate Ritterella tokioka

Ritterazine A, a highly cytotoxic dimeric steroidal alkaloid, from the tunicate Ritterella tokioka Ritterazine A, a highly cytotoxic dimeric steroidal alkaloid, from the tunicate Ritterella tokioka Isolation and structure elucidation of ritterazines B and C, highly cytotoxic dimeric steroidal alkaloids, from the tunicate Ritterella tokioka Ten more ritterazines, cytotoxic steroidal alkaloids from the tunicate Ritterella tokioka Isolation of 13 New Ritterazines from the Tunicate <i>Ritterella tokioka</i> and Chemical Transformation of Ritterazine B¹ Cystodytins D-I, New Cytotoxic Tetracyclic Aromatic Alkaloids from the Okinawan Marine Tunicate Cystodytes dellechiajei Cystodytins D-I, New Cytotoxic Tetracyclic Aromatic Alkaloids from the Okinawan Marine Tunicate Cystodytes dellechiajei Rigidins B−D, New Pyrrolopyrimidine Alkaloids from a Tunicate Cystodytes Species Diplamine, a cytotoxic polyaromatic alkaloid from the tunicate diplosoma sp. Haterumaimides J and K, Potent Cytotoxic Diterpene Alkaloids from the Ascidian Lissoclinum Species