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Matthew A. Williams, Henry Rapoport
Synthesis of enantiomerically pure diethylenetriaminepentaacetic acid analogs. L-Phenylalanine as the educt for substitution at the central acetic acid
J. Org. Chem., 1993, 58 (5), pp 1151–1158
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http://dx.doi.org/10.1021/jo00057a030