N, S, Br co-doped carbon dots: One-step synthesis and fluorescent detection of 6-mercaptopurine in tablet.

"Declaration of competing interest The authors declare that there are no conflicts of interest."

"The authors would like to thank the financial support of Taiyuan Institute of Technology Scientific Research Initial Funding, China (Grant No.: 2022KJ058), the Basic Research Project of Shanxi Province, China (Project No.: 202203021212331), the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi, China (Program Nos.: 2022L529 and 2022L532), and the Fund for Shanxi “1331” Project, China. Qi Wang: Investigation, Data curation, Formal analysis, Methodology, Funding acquisition, Writing - Original draft preparation, Reviewing and Editing; Ying Cheng, Lifeng Ding, Shengling Li, and Jie Zhang: Investigation, Data curation, Formal analysis; Yulan Niu: Supervision, Conceptualization, Funding acquisition; Ziye Jing: Supervision, Conceptualization, Methodology."