For example, naphthyl may include {HEAD ~ its hydrogenated derivatives} such as {TAIL ~ tetrahydronaphthyl} 
such as
For example , naphthyl may include { HEAD ~ its hydrogenated derivatives } such as { TAIL ~ tetrahydronaphthyl }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL