The orchid Agrostophyllum khasiyanum, which earlier yielded agrostophyllin (7-hydroxy-2,6-dimethoxy-5H-phenanthro[4,5-bcd]pyran), on further chemical investigation has now yielded four more new stilbenoids, besides imbricatin (2,7-dihydroxy-6-methoxy-9,10-dihydro-5H-phenanthro[4,5- bcd]pyran), flaccidinin (2,6-dihydroxy-7-methoxy-5H-phenanthro[4,5-bcd]pyran- 5-one), isoflaccidinin (2,7-dihydroxy-6-methoxy-5H-phenanthro[4,5-bcd]pyran- 5-one) and moscatilin (4,4'-dihydroxy-3,3',5-trimethoxybibenzyl) of previously known structures. The structures of the new stilbenoids, designated agrostophyllone, agrostophylloxin, agrostophylloxidin and agrostophyllidin, were established as 7-hydroxy-2,6-dimethoxy-5H- phenanthro[4,5-bcd]pyran-5-one, 2,6,7-trimethoxy-5H-phenanthro[4,5-bcd]pyran- 5-one, 7-hydroxy-2,5,6-trimethoxy-5H-phenanthro[4,5-bcd]pyran and 7-hydroxy- 2,6-dimethoxy-9,10-dihydro-5H-phenanthro[4,5-bcd]pyran, respectively, from spectral and chemical evidence.