The term 'BENZ AND ETHYL ENDERS' refers to a type of organic compound known as an ene-yne. Enes are molecules that contain both a double bond and a single bond between two carbon atoms. The term 'Benz and Ethyl Enders' specifically refers to a type of ene-yne in which the double bond is between a benzene ring and an ethyl group. This type of molecule is important in organic chemistry, as it can be used to create a variety of different compounds.