These are the 3 most relevant analogs with rat TD50 values available in the CPDB database. Read-across using relevant analogs is one method to do risk assessment of nitrosamines that is supported by regulatory agencies. However analogs should have similar reactivity of the nitrosamine functionality as the target. In this case NTHP would be subject to nucleophilic attack at the ring double bond, whereas the other two analogs and the target would not.