3-(hydroxymethyl)furo[3,2-b]naphtho[2,3-d]furan-5,10-dione InChI=1/C10H9NO4/c1-2-14-10(13)8-4-9-7(11-8)3-6(5-12)15-9/h3-5,11H,2H2,1H furo[3,2-b]naphtho[2,3-d]furan-5,10-dione, 3-(hydroxymethyl)-