| http://www.w3.org/ns/prov#value | - n is an integer which can vary from 0 to 3, preferably 0 or 1; a, b, c, and d each independently represents a 1 or 0 to indicate whether its associated R group is present (1) or not (O); R1 and R4 are each independently selected from an unsubstituted or substituted C1-C20, preferably C3-C20 hydrocarbyl, such as alkyl, aryl, alkaryl or aralkyl group, as for example, i-propyl; t-butyl; 2,4,6-trimeth
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