New Constituents from the Korean Sponge Plakortis simplex

New Constituents from the Korean Sponge Plakortis simplex Cyclic Peroxides Derived from the Marine Sponge <i>Plakortis </i><i>s</i><i>implex</i> Four New C₁₆ 1,2-Dioxene-polyketides from the Sponge Plakortis aff. simplex Three New Cyclic Peroxides from the Marine Sponge <i>Plakortis</i> <i>aff simplex</i> New Cyclic Peroxides from the Philippine Sponge <i>Plakinastrella</i> sp. New Bioactive Peroxides from Marine Sponges of the Family Plakiniidae Bioactive Cycloperoxides Isolated from the Puerto Rican Sponge <i>Plakortis halichondrioides</i> Cytotoxic Polyketide Derivatives from the South China Sea Sponge <i>Plakortis simplex</i> Simplexidine, a 4-Alkylpyridinium Alkaloid from the Caribbean Sponge Plakortis simplex Three New Peroxides from the Sponge <i>Plakinastrella</i> Species