Iron–molybdenum cofactor and P-cluster are two essential components of FeMo nitrogenases. A Mo6Fe20S30 cluster has now been synthesized whose fragments topologically resemble the P-cluster of nitrogenase. The new compound (see picture) was characterized by single-crystal X-ray structure analysis and Moessbauer spectroscopy.
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Osterloh et al. (1999) studied this question.