N-cyanoanthranilonitrile (22). 21 and 22 are the isolated endproducts of photolysis. 21 is also the endproduct of flashvacuum thermolysis. An excellent linear correlation between the zero-field splitting parameter D (cm-1) and the spin density ρ on the nitrene N calculated at the B3LYP/EPRIII level is reported (R2 = 0.993 for over 100 nitrenes). Matrix photolysis of 3-phenyltetrazolo[1,5-a]quinazoline (25) affords