
%0 Journal Article
%A Sterns, M 
%A Patrick, JM 
%A Patrick, VA 
%A White, AH 
%T Conformational Studies of Some Piperazine-2,5-Diones: Crystal Structures of Three Isomeric Forms of Methylanhydropicroroccellin (Derivative of a Lichen Diketopiperazine) and a Derivative Bromohydrin
%J Australian Journal of Chemistry
%D 1989/03/01
%V 42
%N 3
%P 349-364
%K 
%R https://doi.org/10.1071/CH9890349
%U https://www.publish.csiro.au/paper/CH9890349 
%X Single-crystal X-ray structure determinations have been carried out on three isomeric forms of the lichen diketopiperazine metabolite methylanhydropicroroccellin , C21H22N2O3, and a related bromohydrin , C20Hl9BrN2O3; all are based on a 6-benzyl-3-benzylidene-1,4- dimethylpiperazine-2,5-dione but differ in the substituents on the &#945; and &#946; carbons at position 6, enabling comparison of the resulting variation in conformation. 
