| http://www.w3.org/ns/prov#value | - A compound of the formula (II) ##STR9## wherein R1, R2, R3 and R4 are the same or different, and represent H or an alkyl group of from 1 to about 10 carbon atoms, wherein at least one of R1, R2, R3 or R4 is alkyl, and wherein when R1, R2, and R4 are H, R3 is an alkyl group of from 2 to about 10 carbon atoms.
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