80455-68-1 FCRC-A48 Fredericamycin Fredericamycin A NSC305263 Spiro[2H-benz[f]indene-2,8'-[8H]cyclopent[g] isoquinoline] -1,1',3,5,8(2'H)-pentone, 6',7'-dihydro-4,9,9'-trihydroxy -6-methoxy-3'-[(1E,3E)-1,3-pentadienyl]-, (2S)-