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![2,8,9-Triisopropyl-2,5,8,9-tetraaza-1-phosphabicyclo[3,3,3]undecane](https://www.sigmaaldrich.com/content/dam/sigma-aldrich/structure3/144/mfcd03701530.eps/_jcr_content/renditions/mfcd03701530-large.png)