N,N′-Methyleno-didemnin A from the Ascidian Trididemnum solidum. Complete NMR Assignments and Confirmation of the Imidazolidinone Ring by Strategic Analysis of ¹J_CH

<i>N</i>,<i>N′</i>-Methyleno-didemnin A from the Ascidian <i>Trididemnum solidum</i>. Complete NMR Assignments and Confirmation of the Imidazolidinone Ring by Strategic Analysis of ¹<i>J</i>_CH Seven new didemnins from the marine tunicate Trididemnum solidum The complete spectral assignment of didemnin H a new constituent of the tunicate Trididemnum cyanophorum A Cyclized Didemnimide Alkaloid from the Caribbean Ascidian Didemnum conchyliatum [Hysp2] and [Hap2]Didemnin B, two new [Hip2]-modified didemnin B from the tunicate Trididemnum cyanophorum Trididemnic acids A and B, aromatic alkaloids from the northeastern pacific ascidian Trididemnum sp. Didmolamide A and B, Two New Cyclic Hexapeptides from the Marine Ascidian <i>Didemnum </i><i>m</i><i>olle</i> Cyclodidemnamide: A new cyclic heptapeptide from the marine ascidian Didemnum Molle Didemnidines A and B, Indole Spermidine Alkaloids from the New Zealand Ascidian<i>Didemnum</i>sp. Didemnidines A and B, Indole Spermidine Alkaloids from the New Zealand Ascidian<i>Didemnum</i>sp.