3-Methoxy-2,7-dihydroxy-5H-phenanthro[4,5-bcd]pyran 5H-phenanthro[4,5-bcd]pyran-2,7-diol, 6-methoxy- 6-Methoxy-5H-4-oxa-pyrene-2,7-diol 6-methoxy-5H-naphtho[8,1,2-cde]chromene-2,7-diol InChI=1/C16H12O4/c1-19-16-11-7-20-13-6-10(17)4-8-2-3-9(5-12(16)18)14(11)15(8)13/h2-6,17-18H,7H2,1H