Front Cover: Simultaneous determination of erythrocyte methotrexate polyglutamates by a novel and simple HPLC‐MS/MS method with stable isotope‐labeled internal standards

DOI: 10.1002/jssc.202001081 The cover picture shows a new HPLC strategy for quantitative analysis of multiple components via single marker (QAMS) to determine nine nucleosides (cytidine, uridine, 2'‒deoxyuridine, inosine, guanosine, 2'‒deoxyguanosine, thymidine, adenosine and 2'‒deoxyadenosine) in Rhizoma Paridis the first time. results methodology validation showed that there was no significant difference between QAMS method external standard method, indicating can applied solve problem shortage reference materials high cost multicomponent analysis. Our work provide an efficient feasible quality assessment other natural products containing nucleosides.