| http://www.w3.org/ns/prov#value | - These end blocks (A) are typically derived from monoalkenyl aromatic compounds having the general formula: ##STR1## wherein X represents hydrogen or an alkyl radical containing 1 or 2 carbon atoms such as a methyl or ethyl radical; Y represents hydrogen or an alkyl radical containing from 1 to 4 carbon atoms such as a methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl or a tert-butyl radical;
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