Formation of the beta series is explained has given two crystalline isomers, designated a- and 8-norconidendrin (111). same structural configuration, while the beta compounds are sterically identical. by an inversion at the carbon atom adjacent to the carbonyl group. Derivatives of the norconidendrins are reported.
![Naphtho[2,3-c]furan-1(3H)-one,4-(3,4-dihydroxyphenyl)-3a,4,9,9a-tetrahydro-6,7-dihydroxy-, (3aR,4S,9aR)- Structure](https://image.chemsrc.com/caspic/274/2316-10-1.png)
![Naphtho[2,3-c]furan-1(3H)-one,4-(3,4-dihydroxyphenyl)-3a,4,9,9a-tetrahydro-6,7-dihydroxy-, (3aR,4S,9aS)- Structure](https://image.chemsrc.com/caspic/454/2643-01-8.png)
![Naphtho[2,3-c]furan-1 (3H)-one, 3a,4,9, 9a-tetrahydro-6-hydroxy-4-(4-hydroxy-3-methoxyphenyl)-7-methoxy-, [3aR-(3a.alpha.,4.alpha.,9a.alpha.)]- Structure](https://image.chemsrc.com/caspic/419/5474-93-1.png)