Here's what rhymes with heterocycles.

Consider these alternatives

pyrrole / whole piperidine / seen unsubstituted / included macrocyclic / heterocyclic heterocyclic / macrocyclic carbamates / states pyridine / line disaccharides / rights tetracyclines / lines sulfonamides / needs quinoline / line pyrethroids / trapezoids furan / an glucosinolates / states