1,4-Etheno-3H,7H-benzo(1,2-c:3,4-c')dipyran-3,7-dione, 9-(3-furanyl)-1,4,4a,5,6,6a,9,10,10a,10b-decahydro-4-hydroxy-4a,10a-dimethyl-, (1R-(1alpha,4beta,4aalpha,6abeta,9beta,10abeta,10balpha))- 4-Hydroxy-15,16-epoxycleroda-2,13(16),14-trieno-17,12-18,1-biscarbolactone 546-97-4 Columbin