| 1 | 274-00-0 | Thiazolo[4,5-b]pyrazine | C5H3N3S | 137.16242 | | |
| 2 | 274-04-4 | Aluminum, [1,2-benzenediolato(2-)-κO1,κO2]hydro- | C6H5AlO2 | 136.09 | | |
| 3 | 274-07-7 | 1,3,2-benzodioxaborole | C6H5BO2 | 119.91 | 12°C(lit.) | Reacts with water. |
| 4 | 274-09-9 | 1,3-Benzodioxole | C7H6O2 | 122.12 | -18 °C | 0.2 g/100 mL (25 ºC) |
| 5 | 274-15-7 | 1,3,2-Benzodioxaphosphole | C6H5O2P | 140.08 | | |
| 6 | 274-19-1 | 1,3,2-Benzodioxastibole | C6H5O2Sb | 230.863 | | |
| 7 | 274-23-7 | 1,3-Dioxolopyrimidine (8CI,9CI) | C5H4N2O2 | 124.1 | | |
| 8 | 274-26-0 | 2H-1,3-benzoxathiole | C7H6OS | 138.19 | | |
| 9 | 274-30-6 | 1,3-BENZODITHIOL | C7H6S2 | 154.25 | | |
| 10 | 274-31-7 | 1,3-Benzodithiol-1-ium | C7H5S2+ | 153.24 | | |
| 11 | 274-40-8 | Indolizine | C8H7N | 117.15 | | |
| 12 | 274-43-1 | Pyrrolo[1,2-c]pyrimidine | C7H6N2 | 118.14 | | |
| 13 | 274-45-3 | Pyrrolo[1,2-a]pyrazine | C7H6N2 | 118.14 | | |
| 14 | 274-47-5 | imidazo[1,5-a]pyridine | C7H6N2 | 118.14 | 52.0 to 57.0 °C | |
| 15 | 274-48-6 | Imidazo[1,5-c]pyrimidine (8CI,9CI) | C6H5N3 | 119.12 | | |
| 16 | 274-49-7 | Imidazo[1,5-a]pyrazine | C6H5N3 | 119.12 | | |
| 17 | 274-55-5 | Pyrrolo[1,2-b]pyridazine | C7H6N2 | 118.14 | | |
| 18 | 274-56-6 | Pyrazolo[1,5-a]pyridine | C7H6N2 | 118.14 | | |
| 19 | 274-57-7 | Pyrazolo[1,5-c]pyrimidine | C6H5N3 | 119.12 | | |
| 20 | 274-59-9 | 1,2,3-TRIAZOLO(1,5-A)PYRIDINE | C6H5N3 | 119.124 | | |
| 21 | 274-66-8 | Pyrrolo[1,2-a]pyrimidine | C7H6N2 | 118.14 | | |
| 22 | 274-67-9 | IMIDAZO[1,5-A]PYRIMIDINE | C6H5N3 | 119.12 | | |
| 23 | 274-68-0 | Imidazo[1,5-a]-1,3,5-triazine (9CI) | C5H4N4 | 120.11 | | |
| 24 | 274-71-5 | pyrazolo[1,5-a]pyrimidine | C6H5N3 | 119.12 | 105 °C | |
| 25 | 274-72-6 | Pyrazolo[1,5-a]-1,3,5-triazine | C5H4N4 | 120.11 | | |
| 26 | 274-74-8 | 4-Bromomethyl-7-Acetoxycoumarin | C12H9BrO4 | 297.10146 | | |
| 27 | 274-76-0 | imidazo(1,2-A)pyridine | C7H6N2 | 118.14 | | |
| 28 | 274-78-2 | imidazo[1,2-c]pyrimidine | C6H5N3 | 119.12 | | |
| 29 | 274-79-3 | imidazo[1,2-a]pyrazine | C6H5N3 | 119.12 | 90-94°C | |
| 30 | 274-80-6 | 1,7,8-triazabicyclo[4.3.0]nona-2,4,6,8-tetraene | C6H5N3 | 119.12 | 36-38 °C | |
| 31 | 274-81-7 | 1,2,4-Triazolo[4,3-c]pyrimidine(9CI) | C5H4N4 | 120.11 | 165-167 °C | |
| 32 | 274-82-8 | 1,2,4]TRIAZOLO[4,3-A]PYRAZINE | C5H4N4 | 120.115 | | |
| 33 | 274-83-9 | 1,2,4-Triazolo[4,3-b]pyridazine | | | | |
| 34 | 274-85-1 | [1,2,4]Triazolo[1,5-a]pyridine | C6H5N3 | 119.12 | 110-112 °C | |
| 35 | 274-86-2 | [1,2,4]Triazolo[1,5-c]pyrimidine | C5H4N4 | 120.11 | | |
| 36 | 274-87-3 | 1,2,3,3a-Tetraaza-3aH-indene | C5H4N4 | 120.11 | 156-157 °C(Solv: ethyl acetate (141-78-6)) | |
| 37 | 274-88-4 | Tetrazolo[1,5-c]pyrimidine | C4H3N5 | 121.1 | | |
| 38 | 274-89-5 | Tetrazolo[1,5-b]pyridazine | C4H3N5 | 121.1 | | |
| 39 | 274-95-3 | Imidazo[1,2-a]pyrimidine | C6H5N3 | 119.12 | 127-129° | |
| 40 | 274-98-6 | 1,2,4-Triazolo[4,3-a]pyrimidine | C5H4N4 | 120.11 | | |