ChemInform Abstract: 4-(5-Hydroxy-4-pyrazolylimino)-2-pyrazolin-5-one und ihre Metallchelate. 3. Mitt. IR- und NMR-spektroskopische Untersuchungen an Rubazonsäuren. Ein ungewöhnliches Achtring-Protonenchelat mit Doppelminimumpotential.

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