Cytotoxic Barrigenol-like Triterpenoids from an Extract of Cyrilla racemiflora Housed in a Repository

Two new [(+)-cyrillins A (1) and B (2)] and four known barrigenol-like triterpenoids (3–6), along with betulinic acid and (+)-3β-O-trans-feruloylbetulinic acid, were isolated from a sample-restricted CH2Cl2-soluble extract of the bark of Cyrilla racemiflora, collected in Dominica. The structures of the new compounds were elucidated by interpretation of their spectroscopic data, and the absolute configuration of the cyclic 1,2-diol unit of...