Isolation and synthesis of 6,7-dihydroxy-4-(3,4-dihydroxyphenyl)naphthalene-2-carboxylic acid from Pellia epiphylla

A new naphthalene derivative, 6,7-dihydroxy-4-(3,4-dihydroxyphenyl)naphthalene-2-carboxylic acid has been isolated from gametophytic tissues of the liverwort Pellia epiphylla. The structure of the compound was elucidated by means of spectroscopic methods and by independent synthesis.