3-(Pyridin-4-ylamino)-4-ethoxycyclobut-3-ene-1,2-dione;3-Ethoxy-4-(4-pyridinylamino)-3-cyclobutene-1,2-dione;3-Ethoxy-4-[(pyridin-4-yl)amino]cyclobut-3-ene-1,2-dione
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