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From The Collaborative International Dictionary of English v.0.48:
Quartenylic \Quar"ten*yl"ic\, a. [Quartene + -yl + -ic.] (Chem.) Pertaining to, or designating, an acid of the acrylic acid series, metameric with crotonic acid, and obtained as a colorless liquid; -- so called from having four carbon atoms in the molecule. Called also isocrotonic acid. [1913 Webster]