New Secosteroids from an Undescribed Gorgonian of the Genus Muricella

New Secosteroids from an Undescribed Gorgonian of the Genus Muricella New Secosteroids from a Gorgonian of the Genus <i>Muricella</i> 9,11-Secosterols with antiproliferative activity from the gorgonian Eunicella cavolini Sinularosides A and B, Bioactive 9,11-Secosteroidal Glycosides from the South China Sea Soft Coral Sinularia humilis Ofwegen Bioactive Sterols from the Starfish<i>Certonardoa</i><i>s</i><i>emiregularis</i> 9,11-Secosterols from the Soft Corals <i>Sinularia </i><i>l</i><i>ochmodes</i> and <i>Sinularia </i><i>l</i><i>eptoclados</i> Four New Steroids from Two Octocorals Calicogorgins A, B, and C, three bioactive sphinganine derivatives from the gorgonian Calicogorgia sp. Additional Cytotoxic Sterols and Saponins from the Starfish <i>Certonardoa </i><i>s</i><i>emiregularis</i> New Steroids and a New Alkaloid from the Gorgonian Isis minorbrachyblasta: Structures, Cytotoxicity, and Antilarval Activity