Question

bicyclo _._._ __________

Explanation:

Step1: Identify the bridge - head atoms

The bridge - head atoms are the two atoms that connect the three rings. In this case, the atoms where the three - ring system meet are the key points.

Step2: Count the number of atoms in each bridge

Count the number of atoms in the three bridges connecting the bridge - head atoms. The first bridge has 3 atoms, the second has 1 atom, and the third has 1 atom.

Step3: Determine the name

The parent name is azasulfane (due to the presence of N and S). The compound is a bicyclic compound.

Answer:

bicyclo [3.1.1] azasulfane