57576-33-7 Azuleno[4,5-b]furan-2(3H)-one, 8-(.beta.-D-glucopyranosyloxy)decahydro-3,6,9-tris(methylene)-, [3aS-(3a.alpha.,6a.alpha.,8.beta.,9a.alpha.,9b.beta.)]- NSC274538 VERNOFLEXUOSIDE