guideline DL-threo-Chloramphenicol-d5: Deuterium-Labeled Antibiotic Reference Standard DL-threo-Chloramphenicol-d5 (D392534) is a deuterium-labeled internal standard for accurate LC-MS/MS quantification of chloramphenicol residues in research and food safety labs. 更新于 2026年11月阅读12分钟