Fredericamycin, potassium salt NSC601617 Spiro[2H-benz[f]indene-2,8'-[8H]cyclopent[g]isoquinoline]- 1,1',3,5,8-pentone, 2',6'-dihydro-4,9,9'-trihydroxy- 7-methoxy-3'-(penta-1,3-dienyl)-, tripotassium salt