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    • De Sousa, Jose R.; Demuner, Antonio J.; Pinheiro, Jose A.; Breitmaier, Eberhard; Cassels Niven, Bruce (1990)
      A highly polar compound isolated from the stem of Petiveria alliacea was shown to be trans-N-methyl-4- methoxyproline on the basis of its microanalysis and spectral data. Dibenzyl trisulphide, previously unknown as a natural ...