Heterocyclic Amines CH CH2CH3 The nitrogen is assigned the number 1. CH3 H H aziridine Pyridine Pyrrolidine Pyrrole 2-methylpyridine > Chapter 19 10Chapter 19 10 Heterocyclic Amines The nitrogen is assigned the number 1. => N H N H N H N N CH3 aziridine Pyrrole Pyrrolidine Pyridine 2-methylpyridine