| http://www.w3.org/ns/prov#value | - R13 is H; C1 -C4 alkyl optionally substituted with one or more halogen atoms; C2 -C4 alkenyl; C3 -C4 cycloalkyl; phenyl; ##STR15## the aminoalkyl groups derived from ??-amino acids such as glycine, L-alanine, L-cysteine, L-proline, and D-alanine; --NR19 R20 ; or C(NH2)R21 R22 ;
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