593168 Disclosed is a method comprising providing a composition including a first ratio between stereoisomers of a oxidosulfanylidene substituted pyridine compound of formula (I) heating the composition in a manner effective to provide either a second, distinct ratio between the stereoisomers or to convert at least a portion of the second pair of diastereomers to the first pair of diastereomers. Also disclosed is a composition, comprising a stereoisomeric mixture of { 1-[6-(trifluoromethyl)pyridin-3-yl]ethyl} (methyl)oxido-lambda4-sulfanylidenecyanamide defined by a first pair of diastereomers and a second pair of diastereomers, wherein the first pair of diastereomers is present relative to the second pair of diastereomers at a ratio of at least about 3:1.
