K. W. Gopinath, T. R. Govindachari, P. C. Parthasarathy, N. Viswanathan
Structure and Stereochemistry of Polyalthic Acid, a new Diterpene Acid
Helvetica Chimica Acta Volume 44 Issue 4, Pages 1040 - 1049
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http://dx.doi.org/10.1002/hlca.19610440422
