| 1 | 271-00-1 | | Cyclopent[d][1,2,3]oxadiazine | C6H4N2O | | |
| 2 | 271-01-2 | | 6H-Pyrrolo[3,4-b]pyridine | C7H6N2 | | |
| 3 | 271-02-3 | | 5H-Pyrrolo[3,4-b]pyridine | C7H6N2 | | |
| 4 | 271-03-4 | 7H-PYRROLO[3,4-D]PYRIMIDINE | 7H-PYRROLO[3,4-D]PYRIMIDINE | C6H5N3 | | |
| 5 | 271-05-6 | Furo[3,4-d]pyrimidine (8CI,9CI) | Furo[3,4-d]pyrimidine (8CI,9CI) | C6H4N2O | | |
| 6 | 271-06-7 | | Thieno[3,4-b]pyridine | C7H5NS | | |
| 7 | 271-07-8 | Thieno[3,4-d]pyrimidine (8CI,9CI) | Thieno[3,4-d]pyrimidine (8CI,9CI) | C6H4N2S | | |
| 8 | 271-08-9 | | Cyclopenta[b]pyran | C8H6O | | |
| 9 | 271-17-0 | Cyclopenta[b]thiopyran | Cyclopenta[b]thiopyran | C8H6S | | |
| 10 | 271-25-0 | 2H-Indole | 2H-Indole | C8H7N | | |
| 11 | 271-26-1 | 3H-Indole | 3H-Indole | C8H7N | | |
| 12 | 271-29-4 | 6-氮杂吲哚 | 6-Azaindole | C7H6N2 | 吲哚;氮杂吲哚;吲哚系列;并环化合物 | 有机合成 |
| 13 | 271-32-9 | 2H-吡咯并[3,2-C]吡啶 | 5-AZAINDOLE | C7H6N2 | | |
| 14 | 271-34-1 | 5-氮杂吲哚 | 5-Azaindole | C7H6N2 | 吡啶;吲哚;通用试剂;杂环砌块;氮杂吲哚;吲哚系列;并环化合物;医药中间体;合成材料中间体 | 有机合成 |
| 15 | 271-35-2 | 1H-吡咯[2,3-D]哒嗪 | 1H-Pyrrolo[2,3-d]pyridazine | C6H5N3 | 杂环化合物 | |
| 16 | 271-38-5 | 1H-Indazole | 1H-Indazole | C7H6N2 | | |
| 17 | 271-42-1 | 2H-吲唑 | 2H-Indazole | C7H6N2 | 中间体 - 医药中间体 | |
| 18 | 271-43-2 | 3H-Indazole | 3H-Indazole | C7H6N2 | | |
| 19 | 271-44-3 | 吲唑 | Indazole | C7H6N2 | 色素类;医药原料;其它杂环;化工原料;试剂和补充物;小分子抑制剂;小分子抑制剂，天然产物;生化试剂-其他化学试剂 | |
| 20 | 271-45-4 | 2H-吡唑并[3,4-C]吡啶 | 1H-pyrazolo[3,4-c]pyridine | C6H5N3 | 中间体 - 医药中间体 | |
| 21 | 271-47-6 | 1H-吡唑并[3,4-c]吡啶 | 1H-pyrazolo[3,4-c]pyridine | C6H5N3 | 咪唑 | |
| 22 | 271-49-8 | 1H-pyrazolo[4,3-c]pyridine | 1H-pyrazolo[4,3-c]pyridine | C6H5N3 | | |
| 23 | 271-50-1 | 2H-吡唑并[4,3-C]吡啶 | 2H-Pyrazolo[4,3-c]pyridine | C6H5N3 | | |
| 24 | 271-52-3 | 1H-吡唑并[4,3-C]吡啶 | 2H-pyrazolo[4,3-c]pyridine | C6H5N3 | 医药中间体 | |
| 25 | 271-55-6 | | 1H-Pyrazolo[3,4-d]pyridazine | C5H4N4 | | |
| 26 | 271-58-9 | 2,1-苯并异噻唑 | 2,1-Benzisoxazole | C7H5NO | 化工;异恶唑;有机中间体 | |
| 27 | 271-61-4 | 1,2-BENZISOTHIAZOLE | 1,2-BENZISOTHIAZOLE | C7H5NS | | |
| 28 | 271-63-6 | 7-氮杂吲哚 | 7-Azaindole | C7H6N2 | 吲哚;氮杂环;芳香族;其它杂环;吲哚系列;医药中间体;精细化学品;杂环化合物;合成材料中间体;化工产品-有机化工 | 有机合成 |
| 29 | 271-68-1 | 4H-吡咯并[2,3-D]嘧啶 | 4H-Pyrrolo[2,3-d]pyrimidine (8CI,9CI) | C6H5N3 | | |
| 30 | 271-69-2 | 6H-Pyrrolo[2,3-d]pyrimidine (8CI,9CI) | 6H-Pyrrolo[2,3-d]pyrimidine (8CI,9CI) | C6H5N3 | | |
| 31 | 271-70-5 | 7H-吡咯并[2,3-D]嘧啶 | 7H-pyrrolo[2,3-d]pyrimidine | C6H5N3 | 吡咯;嘧啶;吡咯类;杂环砌块;修饰碱基;通用试剂;杂环化合物;芳烃衍生物;医药中间体;杂质对照品 | |
| 32 | 271-71-6 | 1H-吡唑[3,4-b]并吡啶 | 1H-pyrazolo[3,4-b]pyridine | C6H5N3 | 吡啶;医药中间体 | |
| 33 | 271-76-1 | 4H-Pyrazolo[3,4-d]pyrimidine (8CI,9CI) | 4H-Pyrazolo[3,4-d]pyrimidine (8CI,9CI) | C5H4N4 | | |
| 34 | 271-77-2 | 6H-Pyrazolo[3,4-d]pyrimidine (8CI,9CI) | 6H-Pyrazolo[3,4-d]pyrimidine (8CI,9CI) | C5H4N4 | | |
| 35 | 271-78-3 | 2H-Pyrazolo[3,4-d]pyrimidine (8CI,9CI) | 2H-Pyrazolo[3,4-d]pyrimidine (8CI,9CI) | C5H4N4 | | |
| 36 | 271-79-4 | 3H-Pyrazolo[3,4-d]pyrimidine (8CI,9CI) | 3H-Pyrazolo[3,4-d]pyrimidine (8CI,9CI) | C5H4N4 | | |
| 37 | 271-80-7 | 1H-吡唑并[3,4-D]嘧啶 | 1H-PYRAZOLO[3,4-D]PYRIMIDINE | C5H4N4 | | |
| 38 | 271-84-1 | Pyrano[2,3-b]pyrrole | Pyrano[2,3-b]pyrrole | C7H5NO | | |
| 39 | 271-89-6 | 氧茚 | 2,3-Benzofuran | C8H6O | 呋喃;标准品;中间体;医药原料;通用试剂;杂环砌块;香精香料;其他原料;有机化工原料;化工产品-有机化工 | 树脂中间体 |
| 40 | 271-92-1 | 呋喃[3,2-C]吡啶 | Furo[3,2-c]pyridine | C7H5NO | | |
| 41 | 271-93-2 | Furo[2,3-d]pyridazine | Furo[2,3-d]pyridazine | C6H4N2O | | |
| 42 | 271-95-4 | 1,2-苯异唑 | 1,2-BENZISOXAZOLE | C7H5NO | 异恶唑;化工中间体 | |