| 1 | 272-01-5 | Furo[2,3-b]pyridine | C7H5NO | 119.1207 | | |
| 2 | 272-02-6 | Furo[2,3-d]pyrimidine (8CI,9CI) | C6H4N2O | 120.11 | | |
| 3 | 272-04-8 | Isoxazolo[5,4-d]pyrimidine (8CI,9CI) | C5H3N3O | 121.1 | | |
| 4 | 272-12-8 | thieno[2,3-c]pyridine | C7H5NS | 135.19 | 58℃ | |
| 5 | 272-14-0 | Thieno[3,2-c]pyridine | C7H5NS | 135.19 | 47-49℃ | |
| 6 | 272-15-1 | Thieno[2,3-d]pyridazine | C6H4N2S | 136.17 | 167 °C | |
| 7 | 272-16-2 | 9-thia-8-azabicyclo[4.3.0]nona-1,3,5,7-tetraene | C7H5NS | 135.19 | 38°C | |
| 8 | 272-18-4 | 3H-2,1-Benzoxathiole (8CI,9CI) | C7H6OS | 138.19 | | |
| 9 | 272-21-9 | 3H-1,2-Benzodithiole | C7H6S2 | 154.25254 | | |
| 10 | 272-23-1 | Thieno[2,3-b]pyridine | C7H5NS | 135.19 | | |
| 11 | 272-24-2 | Thieno[2,3-d]pyrimidine (8CI,9CI) | C6H4N2S | 136.17 | 50 °C | |
| 12 | 272-26-4 | Isothiazolo[5,4-d]pyrimidine (8CI,9CI) | C5H3N3S | 137.16 | | |
| 13 | 272-30-0 | Benzo[B]Selenophene | C8H6Se | 181.09 | 45-50 °C | |
| 14 | 272-31-1 | 1,2-Benzisoselenazole | C7H5NSe | 182.08 | | |
| 15 | 272-32-0 | A-N-Benzoyl-L-ArginineEthylEsterHydrochloride(B | | | | |
| 16 | 272-34-4 | 1H-1-Silaindene, 2,3-dihydro- | C8H10Si | 134.25 | | |
| 17 | 272-35-5 | Benzo[b]tellurophene | C8H6Te | 229.73324 | 67.5°C | |
| 18 | 272-41-3 | Furo[3,4-b]pyrazine | C6H4N2O | 120.11 | | |
| 19 | 272-43-5 | thieno[3,4-b]pyrazine | C6H4N2S | 136.17436 | 47-48℃ | |
| 20 | 272-48-0 | 3H-pyrrolo[3,2-b]pyridine | C7H6N2 | 118.14 | | |
| 21 | 272-49-1 | 4-Azaindole | C7H6N2 | 118.14 | 126-127°C | Soluble in methanol and chloroform. Slightly soluble in water. |
| 22 | 272-50-4 | 5H-Pyrrolo[3,2-d]pyrimidine | C6H5N3 | 119.12 | 175 °C (decomp) | |
| 23 | 272-51-5 | 2H-Pyrazolo[4,3-b]pyridine | C6H5N3 | 119.12 | | |
| 24 | 272-52-6 | 1H-Pyrazolo[4,3-b]pyridine | C6H5N3 | 119.12 | | |
| 25 | 272-53-7 | 7H-Pyrazolo[4,3-d]pyrimidine (8CI,9CI) | C5H4N4 | 120.11 | | |
| 26 | 272-54-8 | 5H-Pyrazolo[4,3-d]pyrimidine (8CI,9CI) | C5H4N4 | 120.11 | | |
| 27 | 272-55-9 | 2H-Pyrazolo[4,3-d]pyrimidine (8CI,9CI) | C5H4N4 | 120.11 | | |
| 28 | 272-56-0 | 3H-Pyrazolo[4,3-d]pyrimidine (8CI,9CI) | C5H4N4 | 120.11 | | |
| 29 | 272-57-1 | 1H-Pyrazolo[4,3-d]pyrimidine (6CI,8CI,9CI) | C5H4N4 | | | |
| 30 | 272-58-2 | Isoxazolo[4,3-d]pyrimidine (8CI,9CI) | C5H3N3O | 121.1 | | |
| 31 | 272-60-6 | 4,7-DIAZA-1H-INDAZOLE | C5H4N4 | 120.11 | 198-200 °C | |
| 32 | 272-62-8 | furo[3,2-b]pyridine | C7H5NO | 119.12 | | |
| 33 | 272-67-3 | THIENO[3,2-B]PYRIDINE | C7H5NS | 135.19 | | |
| 34 | 272-68-4 | Thieno[3,2-d]pyrimidine | C6H4N2S | 136.17 | 83 °C | |
| 35 | 272-94-6 | 2H-Benzimidazole(8CI,9CI) | C7H6N2 | 118.14 | | |
| 36 | 272-96-8 | 4H-iMidazo[4,5-c]pyridine | C6H5N3 | 119.124 | | |
| 37 | 272-97-9 | 5-Azabenzimidazole | C6H5N3 | 119.12 | 168-172°C(lit.) | |