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