prov:value
| - where x, m and Z are as defined above, or oxygen provided only one R4 is oxygen, R5 is a C1-12 alkyl, aryl or arylalkyl group, X is halide, Y is N, S or P and the sum of the carbon atoms in R2, R5 and R4 when R4 is alkyl, aryl, arylalkyl or carboxy-substituted alkyl does not exceed 20.
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