Spiro(cyclohex-2-ene-1,2'(1'H)-cyclopent a(de)naphthacene)-9'-carboxamide, 7',7'a ,8',11',11'a,12'-hexahydro-5',6',7'a,10' ,11'a,12'-hexahydroxy-3'-methoxy-2,6,6-trimethyl-7',8'-dioxo-, (1S,7a'S,11a'S,12 'S)-