5'-methoxy-1',3',3'-trimethyl-6-nitrospiro(2H-1-benzopyran-2,2'-indoline);1,3,3-Trimethyl-5-methoxy-6'-nitrospiro(indoline-2,2'-2'H-chromene);U-2,3,4-Trichlorophenol;5'-methoxy-1',3',3'-trimethyl-6-nitro-1',3'-dihydro-spiro[chromene-2,2'-indole];1',3',3'-trimethyl-5'-methoxy-6-nitrospiro[2H-1-benzopyran-2,2'-3H-indole];
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