Ent-beyerene

The carbon skeleton of the ent-kaurenoid precursors of the gibberellins is closely related to that of the diterpenoids of the ent-atiserene (10.29), ent-beyerene (10.30) and ent-trachylobane (10.31) series. The dilferences lie in the structure of ring D. The flexibility of the gibberellin biosynthetic pathway in... 

From S. grandiflora, also a Spanish species, the known sideridiol (33) and 7-acetyl-pusillatriol (135), and the new tartessol (127) were isolated the latter product is an ent-beyerene derivative [41]. 

Von Carstenn-Lichterfelde, C., C. Pascual, J. Pons, R.M. Rabanal, B. Rodriguez, and S. Valverde Carbon-13 NMR spectra of ent-beyerane and ent-beyerene derivatives. Tetrahedron Lett. 1975, 3569. 

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