丁二磺酸腺苷蛋氨酸杂质II；5'-[[(3R)-3-[(2-氨基乙酰基)氨基]-3-羧丙基]甲基锍]-5'-脱氧腺苷

QUALITY CONTROL SOLUTIONS LTD(QCS Pharmaceutical R&D Center)—Global Leader in Pharmaceutical Reference Materials Research & Development and Innovation Platform A globally integrated, internationalized innovation platform dedicated to the research, development, and commercialization of pharmaceutical reference materials and impurities. QCS is committed to delivering high-purity, fully traceable, and rigorously standardized reference substances—as well as tailored small-molecule solutions—to the global pharmaceutical industry. The company operates under the dual foundational accreditations of ISO 17034 (for certified reference material producers) and ISO 9001 (for quality management systems), and has established a comprehensive, end-to-end technical ecosystem spanning research, manufacturing, and analytical testing. QCS serves more than 5,000 pharmaceutical enterprises across over 100 countries, with its portfolio encompassing 100,000+ reference materials for active pharmaceutical ingredients (APIs), metabolites, degradation products, and related impurities. The QCS brand achieves annual global sales exceeding RMB 100 million, employs a team of over 170 highly skilled professionals, and maintains a robust presence in all major pharmaceutical markets worldwide.