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Stereochemical determination of the flexible trinor-guaiane sesquiterpenoid, antheliol ( 1a ) and the flexible diterpenoid, sangiangol B ( 2a ), isolated from a marine soft coral,  Anthelia  sp., was supported by quantum chemical calculations of NMR chemical shifts at DFT levels. The relative configuration of antheliol is now revealed, as 1 S* , 4 S* , 7 S* , 10 R*  as in  1b , whereas sangiangol B ( 2c ) has complete stereochemistry as 1 S* , 7 R* , 8 R* , 10 R* , 11 R* , 12 S* .

Stereochemical determination of NMR chemical shifts in marine terpenoids, antheliol and sangiangol B, using DFT calculations