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核酸的基本组成单位是核苷酸，它由含氮碱基、戊糖和磷酸三部分组成。含氮碱基分为嘌呤碱基和嘧啶碱基。戊糖在DNA中是脱氧核糖，在RNA中是核糖。 2026-05-30 产品中心 永易搜科技 http://www.nucleosides.cn/product/phosphoramidites/ 亚磷酰胺单体是在核酸化学，尤其是固相合成寡核苷酸过程中极为关键的一类化合物。亚磷酰胺单体是一类含有亚磷酰胺官能团（-P(OR)₂NR₂）的化合物，在核酸固相合成技术里，它是用于逐步构建寡核苷酸链的基本组成单位。 2026-05-30 产品中心 永易搜科技 http://www.nucleosides.cn/product/impurities/ 杂质对照品是化学工业中生产规模相对较小，但具有特定功能、特定用途的化学品。与通用化学品不同，精细化学品并非大量、粗放式生产，而是针对特定市场需求，以较高的技术含量和品质要求进行生产。 2026-05-30 产品中心 永易搜科技 http://www.nucleosides.cn/impurities/idoxuridine/ 54-42-2 2026-05-30 杂质对照品 永易搜科技 http://www.nucleosides.cn/impurities/gemcitabine/ 95058-81-4 2026-05-30 杂质对照品 永易搜科技 http://www.nucleosides.cn/impurities/brivudine/ 69304-47-8 2026-05-30 杂质对照品 永易搜科技 http://www.nucleosides.cn/impurities/acyclovir/ 59277-89-3 2026-05-30 杂质对照品 永易搜科技 http://www.nucleosides.cn/about.html 诺科赛德生物是一家专注于糖化学、核苷（酸）化学及医药中间体研发的高科技企业。公司拥有700平米标准化实验室及资深科学家领衔的研发团队，全面通过ISO9001/14001/45001三体系认证。我们提供高附加值糖化学中间体、核苷类中间体、亚磷酰胺类产品，以及从小试到中试的一站式CRO/CDMO全流程定制服务。深耕抗病毒与抗肿瘤前沿药物领域，致力于成为全球制药行业最值得信赖的长期战略合作伙伴。 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