A chem. investigation of M. divaricatum has resulted in the isolation of 19 coumarins, 5 of which are novel compds. and 18 are khellactone derivs. The coumarins were isolated from the crude exts. by a combination of adsorption chromatog., gel permeation and HPLC; the more successful HPLC sepns. utilized a nitrile bonded phase column. The structures were detd. by 1H NMR and mass spectral studies and by comparisons with literature data. The relative configuration for the entire series was secured from 1H NMR data, while the abs. configuration could be assigned with any certainty only in the cases of 2 of the compds. [on SciFinder(R)]