The chemistry of mucochloric acid was investigated fairly intensively from 1880 to 1905 principally by Hil1132, 3-4 and Simoni~~*~,~ but apparently has not been studied further since. As the half aldehyde of dichloromaleic acid, it was thought to exist in two forms having normal (I, R= H) and pseudo (11, R= H) structures. c1 c1 c= c
