19-Nor- and 18,20-Epoxy-cardenolides from the Leaves of Calotropis gigantea

19-Nor- and 18,20-Epoxy-cardenolides from the Leaves of <i>Calotropis gigantea</i> Calosides A–F, Cardenolides from <i>Calotropis gigantea</i> and Their Cytotoxic Activity Phytochemical and cytotoxic studies on the leaves of Calotropis gigantea Cytotoxicity of cardenolides and cardenolide glycosides from Asclepias curassavica Cytotoxic cardenolides from the latex of Calotropis procera Cytotoxic Principles of a Bangladeshi Crude Drug, Akond Mul (Roots of Calotropis gigantea L.). Cytotoxic Principles from the Formosan Milkweed, <i>Asclepias </i><i>c</i><i>urassavica</i> Cytotoxic Principles from the Formosan Milkweed, <i>Asclepias </i><i>c</i><i>urassavica</i> Identification of a Novel Cardenolide (2‘ ‘-Oxovoruscharin) from <i>Calotropis </i><i>p</i><i>rocera</i> and the Hemisynthesis of Novel Derivatives Displaying Potent in Vitro Antitumor Activities and High in Vivo Tolerance:  Structure−Activity Relationship Analyses Identification of a Novel Cardenolide (2‘ ‘-Oxovoruscharin) from <i>Calotropis </i><i>p</i><i>rocera</i> and the Hemisynthesis of Novel Derivatives Displaying Potent in Vitro Antitumor Activities and High in Vivo Tolerance:  Structure−Activity Relationship Analyses