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[1]CurrentPatentAssignee:BAYERAG-DE2753556,1979,A1[Chem.Abstr.,1979,vol.91,#192974][Chem.Abstr.,1979,vol.91,#192974]
[1]CurrentPatentAssignee:C.H.BoehringerSohnAG&Co.KG-US4579947,1986,A
[1]CurrentPatentAssignee:PFIZERINC-US4168269,1979,A