| http://www.w3.org/ns/prov#value | - Olefinically unsaturated acids of this broad class include acrylic acids such as acrylic acid itself, methacrylic acid, ethacrylic acid, crotonic acid, sorbic acid, cinnamic acid, beta-styryl acrylic acid, hydromuconic acid, itaconic acid, citraconic acid, and the like.
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