| http://www.w3.org/ns/prov#value | - Ketones, ketoacids, and other compounds having two hydrogens in the OL'POSltiOl'l to a carbonyl group may be used as, for example, acetylacetone, acetonylacetone, diacetylacetone, acetophenone, malonic esters such as methyl malonate, ethyl malonate, etc., acetoacetic esters such as ethyl acetoacetate, etc., cyanoacetic esters such as ethyl cyanoacetate, etc.
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