| http://www.w3.org/ns/prov#value | - A method for inhibiting plant growth comprising the steps of preparing a herbistat composition containing a quassinoid represented by the formula ##STR18## wherein R represents hydrogen, oxygen, alkyl, alkenyl, acyl, aryl, halogen, sulfo, nitro, carboxyl, hydroxyl, hydroxyalkyl, alkoxy, or other water soluble sidechain, and Y is a sidechain comprising hydrogen, oxygen, halogen, hydroxyl, ester, ca
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