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the fourth "classical" oxide, mellitic anhydride (c12o9), was apparently obtained by liebig and wöhler in 1830 in their study of mellite ("honeystone"), but was characterized only in 1913, by meyer and steiner.
el cuarto óxido "clásico", el anhídrido melítico (c12o9), fue obtenido aparentemente por liebig y wöhler en 1830 en su estudio de la melita, pero fue caracterizado solo hasta 1913, por meyer y steiner.