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An unknown compound dominant in the aliphatic hydrocarbon fraction of the solvent extract of a Dominican amber sample was isolated and purified using column chromatography and preparative gas chromatography. 1D and 2D NMR analyses allowed its structure to be assigned as 15-nor-cleroda-3,12-diene. The bridgehead methyl group (CH3 at C-19) has a 13C chemical shift of 19.6ppm, typical for a trans-decalin...
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