| 1 | 674-82-8 | 双乙烯酮 | diketene | C4H4O2
| 芳胺产品;化工原料;有机化学;化工材料;其他原料;有机原料;农药中间体;杂质对照品;有机化工原料;其他类杀菌剂 | 医药中间体;染料中间体;农药中间体 |
| 2 | 22125-63-9 | 2-Furanol | 2-Furanol | C4H4O2
| | |
| 3 | 290-67-5 | 1,4-dioxin | 1,4-dioxin | C4H4O2
| | |
| 4 | | 1,4-二【口+咢】【口+井】 | 1,4-dioxine | C4H4O2
| | |
| 5 | 2345-51-9 | 3-丁炔酸 | 3-butynoic acid | C4H4O2
| 有机化学 | |
| 6 | | METHYL PROPIOLAT | METHYL PROPIOLAT | C4H4O2
| | |
| 7 | 922-67-8 | 丙炔酸甲酯 | Methyl propiolate | C4H4O2
| 酯;硅炔类;有机砌块;有机化工;医药原料;通用试剂;化工原料;其他原料;香精香料;化工中间体 | |
| 8 | 3675-13-6 | 2-BUTENEDIAL, (Z)- | 2-BUTENEDIAL, (Z)- | C4H4O2
| | |
| 9 | 1375453-30-7 | 丁-2-炔酸-D3酸 | But-2-ynoic-d3 acid | C4H4O2
| | |
| 10 | 497-23-4 | γ-巴豆酰内酯 | gamma-crotonolactone | C4H4O2
| 呋喃;杂环;有机化学;通用试剂;杂环砌块;医药中间体;含硫化合物;药物中间体;杂质对照品 | |
| 11 | 15506-53-3 | cyclobutane-1,3-dione | cyclobutane-1,3-dione | C4H4O2
| | |
| 12 | | Cyclobutane-1,3-dione. | Cyclobutane-1,3-dione. | C4H4O2
| | |
| 13 | | 4-HYDROXYCROTONOLACTONE | 4-HYDROXYCROTONOLACTONE | C4H4O2
| | |
| 14 | 88996-98-9 | 2H-Oxet-2-one, 4-methyl- | 2H-Oxet-2-one, 4-methyl- | C4H4O2
| | |
| 15 | | 4-methylideneoxetan-2-one | 4-methylideneoxetan-2-one | C4H4O2
| | |
| 16 | | Alkenyl monocarboxylic acid | Alkenyl monocarboxylic acid | C4H4O2
| | |
| 17 | | Formic acid 2-propynyl ester | Formic acid 2-propynyl ester | C4H4O2
| | |
| 18 | | DIKETENE: 50% IN METHYLENE CHLORIDE | DIKETENE: 50% IN METHYLENE CHLORIDE | C4H4O2
| | |
| 19 | 20825-71-2 | 3-Butenoic acid, 4-hydroxy-, gamma-lactone | 3-Butenoic acid, 4-hydroxy-, gamma-lactone | C4H4O2
| | |
| 20 | | DIOXIN-LIKE PCB RH12 CALIBRATION SOLUTION CS1 | DIOXIN-LIKE PCB RH12 CALIBRATION SOLUTION CS1 | C4H4O2
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| 21 | | DIOXIN-LIKE PCB RH12 CALIBRATION SOLUTION CS3H | DIOXIN-LIKE PCB RH12 CALIBRATION SOLUTION CS3H | C4H4O2
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