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