griseusin G

(3′R,3aR,5R,5aS,6′R,11aS,11bR)-3′,7-Dihydroxy-6′-methyl-11a-(2-oxopropyl)-3a,5′,5a,6′,11a,11b-hexahydrospiro[benzo[g]furo[3,2-c]isochromene-5,2′-pyran]-2,4′,6,11(3H,3′H)-tetrone

griseusin G

Spiro[5H-furo[3,2-b]naphtho[2,3-d]pyran-5,2′-[2H]pyran]-2,4′,6,11(3′H,3H)-tetrone, 3a,5′,5a,6′,11a,11b-hexahydro-3′,7-dihydroxy-6′-methyl-11a-(2-oxopropyl)-, (3′R,3aR,5R,5aS,6′R,11aS,11bR)-