| http://www.w3.org/ns/prov#value | - Compounds of formula (I) wherein A is the chain NHCO may be prepared by reaction of the aldehyde (II) or a protected derivative thereof with the glycine derivative (VIII) ##STR8## wherein R1 is a group as defined in formula (I) or a protected derivative thereof and R6 and R7 independently represent C1-4 alkyl.
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