1-(7-acetyl-8-hydroxybenzo[de]chromen-2-yl)acetone 2-propanone, 1-(7-acetyl-8-hydroxynaphtho[1,8-bc]pyran-2-yl)- InChI=1/C17H14O4/c1-9(18)6-12-7-11-4-3-5-13-16(10(2)19)14(20)8-15(21-12)17(11)13/h3-5,7-8,20H,6H2,1-2H