1',3'-Dihydro-8-methoxy-3',3'-dimethyl-6-nitro-1'-phenylspiro[2H-1-benzopyran-2,2'-[2H]indole];1-Phenyl-3,3-dimethyl-8'-methoxy-6'-nitrospiro[1H-indole-2(3H),2'-[2H-1]benzopyran];6-Nitro-8-methoxy-1'-phenyl-3',3'-dimethylspiro[2H-1-benzopyran-2,2'(3'H)-[1H]indole]
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