prov:value
| - d from hydroxyl groups, cyano groups, amino groups and halogen atoms, X is a hydrogen atom or a monovalent group represented by the formula the subscripts p, q, r, s and t each being 0 or a positive integer, the subscript u being a positive integer, the subscripts x and y being each 0, 1, 2 or 3, with the proviso that the sums of the subscripts q+x and s+y are each a positive integer, p+q is in th
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