D-Phenylalanine,2-[3-[4-[12-[2-[bis(carboxymethyl)amino]ethyl]-16-carboxy-15-(carboxymethyl)-3,10-dioxo-2,9,12,15-tetraazahexadec-1-yl]phenyl]-1-oxopropyl]hydrazide, 2,2,2-trifluoroacetate (1:?)
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