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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.