Tetrahedron Letters
Volume 37, Issue 51, 16 December 1996, Pages 9263-9266
Formation of 3,3,5,7-tetranitrooxindole and 3,5,7-trinitroindazole by nitration of oxindole
Jan Bergman and Solveig Bergman
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http://dx.doi.org/10.1016/S0040-4039(96)02139-9