Minor Cassane Diterpenoids of Caesalpinia bonduc

Seven cassane diterpenes, including the known caesaldekarin A, were isolated from the roots of Caesalpinia bonduc, collected in Barbados. The 1H and 13C NMR spectra of all seven compounds were completely assigned by using a combination of 2D NMR experiments, which included 1H-1H COSY, HSQC, HMQC, and HMBC sequences.