To determine the complementary compound with a specific melting point, additional information is needed. The melting point alone is not sufficient to identify a specific compound because many different substances can have similar or identical melting points.
Melting points are characteristic properties of substances, but they are not unique identifiers. Various compounds can have the same or very close melting points. Therefore, to accurately identify a complementary compound, you would need more details, such as the chemical formula or additional physical and chemical properties of the compound in question.