Syncolostemon densiflorus

Syndenolide (35) together with the known 5,6-dihydro-a-pyrone, deacetylboronolide (36), was isolated from Syncolostemon densiflorus (Lamiaceae) 49). The presence of a triol in (35) was demonstrated by D2O induced collapse of three hydroxyl proton signals in its NMR... 

Collett, L.A., M.T. Davies-Coleman, D.E.A. Rivett, S.E. Drewes, and M.M. Horn Absolute Configuration of a-Pyrones from Cryptocarya latifolia and Syncolostemon densiflorus. Phytochem., 4, 935 (1997). 

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