Pachypodol (4,5 '-dihydroxy-3,3 ',7-trimethoxyflavone)

One of the products obtained from the fruit of the indigenous Australian tr ee Melicope ellyrana has been confirmed as the flavonoid pachypodol (4,5'-d ihydroxy-3,3',7-trimethoxyflavone), C18H16O7. This compound is similar to a number of the flavonones from the same species with the exception of the r educed side chain. The usual intramolecular hydrogen bonding between the hy droxy and the adjacent carbonyl or methoxy substituent groups is found, tog ether with intermolecular hydrogen bonding between one of these hydroxy gro ups and a methoxy O atom [O . . .O 2.875 (4) Angstrom], giving an infinite chain.