prov:value
| - where x is 2-4, m is 1-20, and Z is hydrogen, a C1-3 alkyl group or a C1-14 acyl group, or oxygen provided only one R4 is oxygen, R5 is a C4-12 alkyl, aryl or arylalkyl group, X is a halide, Y is N, S or P, and the sum of the carbon atoms in R5 and R4 when R4 is alkyl, aryl, arylalkyl or carboxy-substituted alkyl does not exceed 20.
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