prov:value
| - Typically, R1 is an amino acid side chain moiety selected from ???H, ???C1-C6 alkyl, ???C2-C6 alkenyl, -L-O???C(O)???R???, -L-C(O)???O???R???, -L-A, -L-NR???R???, -L-Het-C(O)-Het-R??? and -L-Het-R???, wherein L, R???, R???, -Het- and R?????? are as defined above.
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