(2E)-1-(1,3,6,8-tetramethoxy-2-naphthyl)but-2-en-1-one 1-(1,3,6,8-Tetramethoxy-naphthalen-2-yl)-but-2-en-1-one 2-buten-1-one, 1-(1,3,6,8-tetramethoxy-2-naphthalenyl)-, (2E)- Guieranone A InChI=1/C18H20O5/c1-6-7-13(19)17-14(21-3)9-11-8-12(20-2)10-15(22-4)16(11)18(17)23-5/h6-10H,1-5H3/b7-6