Chrysean has been isolated in two forms; whether they are stereosoimers or only dimorphic forms is discussed. A mechanism of formation of chrysean is suggested. With methyl iodide it gives readily the S-methyl derivative which reacts easily with aniline,p-chloraniline andm-aminophenol to furnish the amidino derivatives of formula (IX). Chrysean on being refluxed with ethyl acetoacetate in alcohol gave the acrylidene derivative (X) which cyclises on heating to the pyridinothiazole derivative (XI). Ethyl acetoacetate and chrysean at higher temperature condensed to yield the acetoacetyl derivative (XIII) which however did not cyclise to furnish (XIV).