| http://www.w3.org/ns/prov#value | - (f) when one Z1 is ##STR5## wherein (i) when each n'=1 with each Z' being --O--CO-- or --CO--O--, or (ii) when one n'=1 with Z' being --O--CO-- or --CO--O-- and the other n'=zero resulting in the other Z' being a direct bond and R1 is a group having only one carbon atom, then n must have a value of 1 or 2 and R1 is a group having only one carbon atom.
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