1,4-Naphthalenedione, 6-ethyl-2,3,5,7,8-pentahydroxy- 1,4-Naphthoquinone, 6-ethyl-2,3,5,7,8-pentahydroxy- 1471-96-1 6-Ethyl-2,3,7-trihydroxynaphthazarin ECHINOCHROME A NSC291291