Four new benzo[d,e]isochromene derivatives from rhizomes of Musa basjoo

Four new compounds, basjoochromene A (1), basjoochromene B (2), basjoochromene C (3) and basjoochromene D (4) were isolated from the 70% ethanol extract of the rhizomes of Musa basjoo using column chromatography techniques. Their structures were elucidated on the basis of spectroscopic data interpretation, mass spectrometric analyses.