| http://www.w3.org/ns/prov#value | - said Y.sub.3 A being 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;(b) forming said cyclic compounds from feed compounds of said compound mixture, said cyc
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