title: Photobiological activity in yeast of derivatives of psoralen substituted at the 3,4 and/or the 4',5' reaction site.
mesh_terms: D011564:Furocoumarins / Q000494:pharmacology*; D009154:Mutation; D012441:Saccharomyces cerevisiae / Q000187:drug effects* / Q000235:genetics / Q000528:radiation effects
chemical_list: D011564:Furocoumarins