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The authors wish to thank F. Dennis for providing mass spectra of the esters of GA 1-GA 47 , T. Wachs of the Cornell Mass Spectrometry Service and T. Gianfania for their assistance with the mass spectrometry portion of the study. Further gratitude is extended to H. VanEtten and R. Millar for their thoughtful suggestions in reviewing this manuscript. Particular thanks are due S. V. Beer who generously provided space and equipment.

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