Phloroglucinolysis of 10 and 17 (Figure ) further confirmed their structures. Purification of the phloroglucinolysis products resulted in the isolation of 1 and 2 from 10, as well as 2 and 3 from 17, respectively. In addition to dimer 2, the phloroglucinolysis monomer 1 and dimer 3 were used as stereochemical reference points in the subsequent structure elucidation of other trimers and tetramers.