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Evaluation of the maturity of domestic refuse compost has been widely recognized as one of the most important problems concerning the composting process and the application of this product to the land. This has given rise, in Printed in Great Britain

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The title compound [systematic name: 3,8-dihydr­oxy-3-(hydroxy­meth­yl)-9-methyl-6-methyl­enedeca­hydro­azuleno[4,5-b]furan-2(3H)-one], C15H22O5, is a sesquiterpene lactone showing the typical tricyclic guaianolide skeleton which has been isolated, together with other related metabolites, from the plant Centaurea musimomum. The present study confirms the mol­ecular structure, assigned by 1H NMR and MS spectroscopy, as well as the the 11β-hydroxy­methyl, 3β-hydr­oxy and 4α-methyl stereochemistry. The crystal structure is built through a network of O—H⋯O hydrogen bonds involving the three hydroxyl groups that are present in the mol­ecular skeleton.