(3-beta,14R)-10,20-Didehydro-3,5,14,16-tetrahydroxygrayanotoxan-6-one 28371-51-9 6-Dehydrograyanotoxin II BRN 2674036 Grayanotoxan-6-one, 10,20-didehydro-3,5,14,16-tetrahydroxy-, (3-beta,14R)-