| 1 | 108-97-4 | 吡喃-4-酮 | gamma-pyrone | C5H4O2
| 吡喃;医药及有机合成中间体 | |
| 2 | 98-01-1 | 糠醛 | 2-Furaldehyde | C5H4O2
| 呋喃;醛类;糠醛;呋喃类;标准品;通用试剂;醛酮腙类;杀菌剂类;医药原料;化工助剂 | 农药;医药;涂料 |
| 3 | 504-31-4 | α-吡喃酮 | 2H-Pyran-2-One | C5H4O2
| | |
| 4 | 5963-80-4 | 4-Penten-2-ynoic acid | 4-Penten-2-ynoic acid | C5H4O2
| | |
| 5 | 498-60-2 | 3-糠醛 | furan-3-carboxaldehyde | C5H4O2
| 醛;杂环;有机砌块;通用试剂;化工原料;羰基化合物;有机化工原料;化工产品-有机化工 | |
| 6 | 28750-51-8 | 1-Cyclopentene-3,4-dione | 1-Cyclopentene-3,4-dione | C5H4O2
| | |
| 7 | 92544-22-4 | 2-methylene-3(2H)-furanone | 2-methylene-3(2H)-furanone | C5H4O2
| | |
| 8 | | 4-METHYLENEBUT-2-EN-4-OLIDE | 4-METHYLENEBUT-2-EN-4-OLIDE | C5H4O2
| | |
| 9 | 22980-23-0 | 2-Oxabicyclo[2.2.0]hex-5-en-3-one | 2-Oxabicyclo[2.2.0]hex-5-en-3-one | C5H4O2
| | |
| 10 | 19192-82-6 | | 3-Oxatricyclo[3.1.0.02,6]hexan-4-one | C5H4O2
| | |