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Polyethylene Glycol Conjugates of Methotrexate Varying in Their Molecular Weight from MW 750 to MW 40000: Synthesis, Characterization, and Structure−Activity Relationships in Vitro and in Vivo | Bioconjugate Chemistry
![Traffic jam on the A 81 Leonberg-Heilbronn before Engelberg tunnel after an accident, Baden-Wuerttemberg, Germany, Europe Stock Photo - Alamy Traffic jam on the A 81 Leonberg-Heilbronn before Engelberg tunnel after an accident, Baden-Wuerttemberg, Germany, Europe Stock Photo - Alamy](https://c8.alamy.com/comp/BE6RG6/traffic-jam-on-the-a-81-leonberg-heilbronn-before-engelberg-tunnel-BE6RG6.jpg)
Traffic jam on the A 81 Leonberg-Heilbronn before Engelberg tunnel after an accident, Baden-Wuerttemberg, Germany, Europe Stock Photo - Alamy
![Polyethylene Glycol Conjugates of Methotrexate Varying in Their Molecular Weight from MW 750 to MW 40000: Synthesis, Characterization, and Structure−Activity Relationships in Vitro and in Vivo | Bioconjugate Chemistry Polyethylene Glycol Conjugates of Methotrexate Varying in Their Molecular Weight from MW 750 to MW 40000: Synthesis, Characterization, and Structure−Activity Relationships in Vitro and in Vivo | Bioconjugate Chemistry](https://pubs.acs.org/cms/10.1021/bc010098m/asset/images/medium/bc010098mh00001.gif)