How many of the following ligands can form at least one five-membered chelate ring using one N donor and one O donor? gly⁻, acac⁻, ox²⁻, en, NTA³⁻, picolinate, 8-hydroxyquinolinate, dien, EDTA⁴⁻

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gly⁻, NTA³⁻, picolinate, 8-hydroxyquinolinate and EDTA⁴⁻ each have an N and an O donor closing a five-membered ring. acac⁻ and ox²⁻ have only O donors, and en and dien have only N donors. Count = 5.

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