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EDC hydrochloride (EDC-HCl Crosslinker) 是一种水溶性的碳二亚胺类化合物。EDC hydrochloride 作为缩合剂，通过羧基和氨基的缩合反应形成肽键，可用于合成具有特定序列和功能的肽。EDC hydrochloride 可将半抗原共价结合到载体蛋白上，形成免疫抗原，用于疫苗研究。EDC hydrochloride 能够与核酸的5′磷酸基团反应，用于 DNA 和 RNA 的标记。EDC hydrochloride 可将蛋白质与核酸交联，用于制备免疫交联物。EDC hydrochloride 作为交联剂，连接生物分子的胺反应性 NHS 酯与羧基，可用于蛋白质偶联，创造具有新特性和功能的杂交分子。

5'-Ethynyl-2'-deoxycytidine (EdC) functions as a nucleoside analog effectively inhibiting the replication of herpes simplex virus-1 (HSV-1) KOS strain with an ID50 of 0.2 μg/mL. Additionally, it decreases virus-induced cytopathogenic effects in PRK cells for HSV-1, HSV-2, and vaccinia virus strains, demonstrating MIC values between 0.2 to 5 μg/mL. EdC acts as a thymidylate synthetase inhibitor, selectively impacting the DNA incorporation rates of [1',2'-3H]deoxyuridine compared to [CH3-3H]deoxythymidine in PRK cells with ID50s of 3 and 120 μg/mL, respectively. It further inhibits thymidine synthetase and curtails L1210 cell proliferation, a process reversible by deoxythymidine (ID50s are 4.4 and 1,000 μg/mL, respectively). Also, EdC is utilized in monitoring DNA synthesis and cellular replication through click chemistry conjugation, linking its ethynyl group with the azido group of various fluorochromes.