2-Propenoic acid, 3-(6,7-dihydroxy-5-benzofuranyl)-, .delta.-lactone 2009-24-7 7H-Furo[3,2-g][1]benzopyran-7-one, 9-hydroxy- 8-Hydroxypsoralen 8-Hydroxypsoralene NSC401269 Psoralen, 8-hydroxy- XANTHOTOXOL