prov:value
| - 0-6 alkyl--S(O)r -; R12 is R', --C(O)R', --C(O)NR'2, --C(O)OR', --S(O)m R' or S(O)m NR'2 ; R13 is R', --CF3, --SR', or --OR'; R' is H, C1-6 alkyl, C3-7 cycloalkyl--C0-4 alkyl or Ar-C0-4 alkyl; R is R' or --C(O)R'; AA is an amino acid with the carboxyl group optionally protected; U and V are absent or CO, CR'2, C(???CH'2), S(O)n, O, NR', CR'OR', CR'(OR)CR'2, CR'2 CR'(OR), C(O)CR'2, CR'2 C(O), CO
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