3-[(3,6-Dihydroxy-2,5-dioxo-4-undecylcyclohexa-1(6),3-dienyl)methyl]-2,5-dihydroxy-6-undecylcyclohexa-2,5-diene-1,4-diones 4370-68-7 AIDS-009912 AIDS009912 NSC87413 Vilangin