Figure 1 - full size

Figure 1.
Figure 1. Decarboxylation of 5-nitro-3-carboxybenzisoxazole 2 proceeds through a charge-delocalized transition state 3 to give salicylonitrile 4. Naphthalene disulfonate 1 was used to elicit the decarboxylase antibody 21D8 through a covalent linkage to keyhole limpet hemocyanin (KLH).