Lutz F. Tietze и др.
Anticancer Agents, 15. Squaric Acid Diethyl Ester: A New Coupling Reagent for the Formation of Drug Biopolymer Conjugates. Synthesis of Squaric Acid Ester Amides and Diamide
Chemische Berichte Volume 124 Issue 5, Pages 1215 - 1221 (1991)
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http://dx.doi.org/10.1002/cber.19911240539