3,6,9-trimethoxyphenanthrene InChI=1/C17H16O3/c1-18-12-5-4-11-8-17(20-3)14-7-6-13(19-2)10-16(14)15(11)9-12/h4-10H,1-3H phenanthrene, 3,6,9-trimethoxy-