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![1'',3''-Dihydro-1'',3'',3''-trimethyl-6-nitrospiro[2H-1-benzopyran-2,2''-(2H)-indole]](https://www.sigmaaldrich.com/content/dam/sigma-aldrich/structure3/122/mfcd00059175.eps/_jcr_content/renditions/mfcd00059175-large.png)