General description Certified content by quantitative NMR incl. uncertainty and expiry are given in the certificate.Download your certificate at: http://www.sigma-aldrich.com. Principle DNA 加合物;优先地将甲基加合到 DNA 的 7-鸟嘌呤,也可加合到 3-腺嘌呤和 3-鸟嘌呤。 法律信息 TraceCERT 注册商标 Sigma-Aldrich Co. LLC