From the whole plant of Aerides crispum, a new phenanthropyran derivat
ive was isolated. Its structure was elucidated as ihydroxy-1,3-dimetho
xy-9,10-dihydrophenanthropyran on the basis of spectroscopic data. Thi
s is the first report of phenanthropyran from A. crispum. (C) 1998 Els
evier Science Ltd. All rights reserved.