R2 and {HEAD ~ R3}, together with the carbon atom to which they are bonded, are {TAIL ~ a cyclopropylidene, cyclobutylidene}, cyclopentylidene, or cyclohexylidene 
are
R2 and { HEAD ~ R3 } , together with the carbon atom to which they are bonded , are { TAIL ~ a cyclopropylidene , cyclobutylidene } , cyclopentylidene , or cyclohexylidene
OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH