Ester

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1. A chemical formulation that is oil-soluble, and therefore is typically effective in penetrating waxy leaf surfaces; esters typically react poorly with "hard" water, and are generally more volatile than other formulations.

Acyl_Halide_plus_Alcohol.PNG

Example of a reaction that forms an ester from an acid (acyl halide) and an alcohol. Water is also extracted when an ester is formed.
Source: http://en.wikipedia.org/wiki/Acyl_halide