IUPAC:5,6,8-trihydroxy-2,3-dimethyl-9-{5,6,8-trihydroxy-2,3-dimethyl-4-oxo-2H,3H,4H-naphtho[2,3-b]pyran-9-yl}-2H,3H,4H-naphtho[2,3-b]pyran-4-one
IUPAC:5,6,8-trihydroxy-2,3-dimethyl-9-{5,6,8-trihydroxy-2,3-dimethyl-4-oxo-2H,3H,4H-naphtho[2,3-b]pyran-9-yl}-2H,3H,4H-naphtho[2,3-b]pyran-4-one