| http://www.w3.org/ns/prov#value | - The compounds of the present invention are shown by Formulas XI, XII, XIV, XV, XVI, XVII, XVIII, XX, XXII, and XXIII. Formulas I and II refer to compounds included within the enlarged group of compounds covered by Formulas XX and XI, respectively. ##STR1## In these formulas, R1 is hydrogen or the group A wherein A is a lower alkyl or lower alkenyl group each having up to 8 carbon atoms, pyridylmet
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