Begin with a tetrahedral (sp3) carbon center bearing four substituents: 
  1. A primary amino group (-NH2).  
  2. A phenyl ring, unsubstituted. 
  3. A hydrogen atom.  
  4. A decalin system, i.e., a bicyclic structure of two fused cyclohexane rings. The attachment to the central carbon is meta-positioned to one of the ring junctions.