prov:value
| - Though the nature of B can vary, it preferably is such that it complements the poly(oxyalkylene) moiety in maintaining or establishing the desired solubility of the oxyalkylene- The radical B can be a hydrogen atom, acyl, such as C6 H5 C(O)--, alkyl, preferably lower alkyl, such as methyl, hydroxyethyl, hydroxypropyl, mercaptoethyl and aminoethyl, or aryl, such as phenyl, chlorophenyl, methoxyphen
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