| http://www.w3.org/ns/prov#value | - For example, U.S. Pat. No. 3,368,943, Gilbert, issued Feb. 13, 1968, discloses compounds of the formula: ##STR4## wherein a is 0 or 1; X is chlorine or bromine; R is methyl or ethyl; and R' is a saturated C4 -C12 aliphatic branched or linear chain, benzyl, phenol ethyl, or phenol propyl radical.
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