N-tert-butyl-4-iodo-N-methylcubane-1-carboxamide N-tert-butyl-4-iodo-N-methyl-cubane-1-carboxamide N-tert-butyl-4-iodo-N-methyl-1-cubanecarboxamide NCI60_017397 AIDS-139789 AIDS139789 N-(tert-Butyl)-4-iodo-N-methyl-1-cubanecarboxamide NSC649892