| http://www.w3.org/ns/prov#value | - Examples of suitable substituted phenylalanine derivatives include those corresponding to the formula: ##STR1## wherein Ph is phenyl (substituted or unsubstituted), while X is --OH, --SH, --Cl, --Br, --I, --OCOCH3, --OCOOCH3, --NH2 or --SCH3 and R is a lower alkyl group having from 1 to 4 carbon atoms.
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