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organic compounds
The title compound, rel-(1S,4R,7R,9S)-tetracyclo[5.4.1.04,12.09,12]dodec-10-enyl-1-acetic acid, C14H18O2, has been prepared and its structure elucidated. The geometry of the central C(C)4 substructure shows a considerable distortion from an ideal tetrahedral arrangement towards planarity, with two opposite bond angles of 119.2 (2) and 134.9 (2)°. The other bridgehead bond angle of the trans-bicyclo[3.3.0]octane subunit is also large, with a value of 128.0 (2)°.