prov:value
| - The practitioner has a a well-established literature of peptide chemistry to draw upon, in combination with the information contained herein, for guidance on synthetic strategies, protecting groups, and other materials and methods useful for the synthesis of the compounds of this invention, including compounds containing the various R???, R1, R2, R3, R3??? and R4 substituents and X1, X2 and X3 moi
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