| http://www.w3.org/ns/prov#value | - ng a linear trimer of base molecules, and said Y.sub.4 A being a linear tetramer of base molecules, said base molecules selected from the group consisting of.alpha.-hydroxycarboxylic acids, .alpha.-hydroxyamides, salts and other derivative compounds of the foregoing, and combinations thereof; and(b) forming at least two different cyclic compounds from said feed compounds selected from the group co
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