"Schunck analysed samples of chrysammic acid, now known to be 1,8–dihydroxy–2,4,5,7–tetranitroanthraquinone, and several of its metal salts, concluding that the formula of the acid was C15H3N4O12.This is very near to the currently accepted formula of C14H4N4O12 which was obtained by Mulder a few years later.