| http://www.w3.org/ns/prov#value | - ng: In another embodiment of formula [I-3], R3 is a hydrogen atom or a methyl group, R5 is a ???COOH group or a ???COOMe group, and R6 may be selected from the following: In another embodiment of formula [I-3], Z1 may be selected from the following: a ???O??? group; a ???NHCO??? group; a ???NHCH2??? group; a ???OCH2??? group; a ???CONH??? group; or a ???NHSO2??? group.
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