1,2,3-Oxadiazole 1,2,3-Triazole 1,2,4-Triazole 1,2-Oxathiolane 1,3,4-Thiadiazole
1,3,5-Triazine 1,3,5-Trioxane 1,3,5-Trithiane 1,3-dioxolane 1,4-diazepane
1,4-Dioxane 1,4-Dioxine 1,4-Dithiane 1,4-Oxathiane 1,4-Oxazine
1,4-Thiazine 1,8-Naphthyridine 1-Pyrroline 10H-Phenothiazine 10H-Phenoxazine
1H-Benzoimidazole 1H-Benzotriazole 1H-Indazole 1H-Perimidine 1H-pyrrolizine
2-Pyrazoline 2-Pyrroline 2H-1,5,2-dithiazine 2H-Imidazolidine 2H-Oxacine
2H-Pyran 3,4-dihydro-2H-pyran 3-Pyrazoline 3-Pyrroline 3H-Indole
4H-Pyran 4H-Quinozoline 6-Azaindole 6H-1,2,5-thiadiazine 7-Azabenzotriazole
7-Azaindole 9H-Carbazole 9H-Xanthene Acenaphthene Acenaphthylene
Acridine Adamantane Anthracene Azepine Azetidine
Aziridine Azocine Azulene Benzofuran Benzothiazole
Benzothiophene Benzoxazole Bicyclo[2.2.2]octane Chromane Chromene
Cinnoline Dihydrobenzofuran Fluorene Furan(1,2,5-Oxadiazole) Furan
Imidazole Imidazolidine Indane Indene Indole
Indoline Indolizine Isobenzofuran Isobenzothiophene Isochromane
Isoindole Isoindoline Isoquinoline Isothiazole Isothiazolidine
Isoxazole Isoxazolidine Morpholine Naphthacene Naphthalene
Norbornanne Oxazole Oxazolidine Oxepine oxetane
Oxirane Pentalene Phenanthrene Phenazine Phthalazine
Piperidine Piperzaine Purine Pyrazine Pyrazole
Pyrazolidine Pyrene Pyridazine Pyridine Pyridone
Pyrimidine Pyrone Pyrrole Pyrrolidine Quinazoline
Quinoline Quinoxaline Tetrahydrothiophene Tetrahydro-pyran Tetrahydrofuran
Tetralin Tetrazole Thianthrene Thiazole Thiazolidin
Thieno[3,2-c]pyridine Thiepine Thiirane Thiomorpholine Thiophene
Urotropine [1,10]-Perimidine