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1-羟乙基-3,3-二甲基-6'-硝基吲哚啉螺吡喃 , 1'-(2-羟乙基)-3',3'-二甲基-6-硝基螺[1(2H)-苯并吡喃-2,2'-吲哚啉] , 1-羟乙基-3,3-二甲基-6-硝基吲哚啉螺吡喃 , 1-(2-羟乙基)-3,3-二甲基吲哚啉-6'-硝基苯并螺吡喃, 2-(3',3'-Dimethyl-6-nitrospiro[chromene-2,2'-indolin]-1'-yl)ethanol, Spiro[2H-1-benzopyran-2,2'-[2H]indole]-1'(3'H)-ethanol, 3',3'-dimethyl-6-nitro-, 1-(2-Hydroxyethyl)-3,3-dimethylindolino-6'-nitrobenzopyrylospiran, 2-(3',3'-dimethyl-6-nitrospiro[chromene-2,2'-indole]-1'-yl)ethanol, 1'-(2-Hydroxyethyl)-3',3'-dimethyl-6-nitrospiro[1(2H)-benzopyran-2,2'-indoline], 2-(3',3'-Dimethyl-6-nitrospiro[chromene-2,2'-indol]-1'(3'H)-yl)ethanol, 3',3'-Dimethyl-6-nitro-spiro[2H-1-benzopyran-2,2'-indoline]-1'-ethanol, 3',3'-Dimethyl-1'-(beta-hydroxyethyl)-6-nitrospiro[2H-1-benzopyran-2,2'-indoline]